Malicious PDF — malware analysis report

Static analysis result for SHA-256 847412b630b6e794…

MALICIOUS

PDF

77.8 KB Created: 2021-05-13 21:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 283b75248317e9353593b211c5f01a56 SHA-1: ee3e17b324644d72e4caeeedc1d543899540ab5a SHA-256: 847412b630b6e794096141dae635b50b53ac45e6164ac32f1a1628bede17922c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=kitchenaid+refrigerator+water+filter+plug PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fd273a91e894.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/f8ee4e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5fd08534618c9.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/gikitopaga-lepab-kijupujono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5feb27a33d793.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/fawojidex.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/2843065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5ff783a60bc6e.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/4159839.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/zikubutaka-fubowiwo-savod.pdfIn PDF document text
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/muzanilitof.pdfIn PDF document text
    • https://lolimoxozidexus.weebly.com/uploads/1/3/2/6/132682882/zusedaxe_duvajidixugip_muzidorasu.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/662881.pdfIn PDF document text
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/94046da503a2506.pdfIn PDF document text
    • https://welabelodaset.weebly.com/uploads/1/3/5/3/135399274/8155661.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/kajisumidun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibezage.epizy.com/supufinivutenasefoxuxu.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_a4d6d8694522474b93b3a41b74a3692f.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_08b1b040ac76426bb9abbf5e53e30d62.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_a5a6e454a2f34be1b320edcae4bc9446.pdf?index=trueIn PDF document text
    • http://dudolisimak.epizy.com/6th_grade_reading_comprehension_test_with_answers.pdfIn PDF document text
    • http://nasotigide.rf.gd/22672482367.pdfIn PDF document text
    • http://fipejawopali.epizy.com/bribie_island_fishing_report_2017.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5300 bytes
SHA-256: ae36f0398885e3b6cf9d2eea3f0d0f60d9dce9b098ec57c4dbca53ea79939796
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10812 bytes
SHA-256: 88182da4276569bffa6b370362a34adcb8cc5a7db491521b0ce10b9e2bcffab5