Malicious PDF — malware analysis report

Static analysis result for SHA-256 a703c8efb2ae1be1…

MALICIOUS

PDF

88.9 KB Created: 2021-03-24 06:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7745cfb21f968873880c07f07f5abb6c SHA-1: 5a2ef0914a52bb9a2ed7d5c7cede0497b258c01e SHA-256: a703c8efb2ae1be15f33711abfcc690c099300e57a01bfbbbeed0ed6af176ef2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm designed to redirect users to various external resources. The document body, though heavily obfuscated, contains references to 'Monte Carlo Excel simulation' and is associated with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a large number of links for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/wix?keyword=monte+carlo+excel+simulation PDF link annotation
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/5068616.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/ijahjid/lofutifofonelefezufileri.pdfIn PDF document text
    • https://lukijijuvuz.weebly.com/uploads/1/3/4/7/134742917/7781732.pdfIn PDF document text
    • https://vanufutalolu.weebly.com/uploads/1/3/1/1/131164160/dipefekulufe-mijarilesutalal-lovabifiguw.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/mitetalipazov_vijiterodumugux_lizuwoka.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/how_to_reset_service_engine_light_on_2001_ford_mustang.pdfIn PDF document text
    • https://mikofamix.weebly.com/uploads/1/3/4/8/134882663/pagikemotafomum.pdfIn PDF document text
    • https://cdn.sqhk.co/dabekojov/gifhaa4/59568669646.pdfIn PDF document text
    • https://gawupuvuto.weebly.com/uploads/1/3/4/5/134530234/1365941.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/busodogibo.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/gjSdHje/80995038815.pdfIn PDF document text
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/fatabozorogube_tutes_talogewidawowa.pdfIn PDF document text
    • https://xasizati.weebly.com/uploads/1/3/5/9/135978204/lagenuzukixofuke.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/kukokufegulafidokeza.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/abiogenesis_and_biogenesis.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/hdufAja/watch_1045_espn.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/workout_frequency_for_natural_bodybuilders.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/7324159.pdfIn PDF document text
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/botefowiw-nugepiruvazo-relezemaxum.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/3577856.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/fKxpmFM/pet_rescue_saga_help_2170.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/744e0e0.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/xopela-suvidenopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijadogif.atwebpages.com/fotizameligedasaja.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_c51a6c9df24f41c9954d9315db6f5a98.pdf?index=trueIn PDF document text
    • http://najekaweza.onlinewebshop.net/vadawevuz.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_35fc0b995e2d437c8be819301ea1823e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 5016 bytes
SHA-256: 5dc70712a15259756a89f36000bf3e823df26f1ca37d237ddc41a7b458c463e8
font_01_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 11424 bytes
SHA-256: 984cf79e925b31f4a540035fa4290f69d563f4a9b97ec5e253bc7556a2f5ff50