Malicious PDF — malware analysis report

Static analysis result for SHA-256 6119183629bef641…

MALICIOUS

PDF

97.7 KB Created: 2021-02-15 07:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b48128bf8f2a399567ecf62f9e7d49e SHA-1: 0ecd302cc229c110743efb9991adfb99655d2b46 SHA-256: 6119183629bef641c122d8d240e10a2e1697a3445f2910801f258a15eb242db8
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious workflow aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=analysis+of+alum+lab+calculations PDF link annotation
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/4099795.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/54458.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/jobojugozatofir_mekulefoxeno_masejefada_wexuvanejini.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/watotomosibiwow_gukanasexirurej.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ij0igpW/kofukibidimu.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/icRjQgi/score_basketball_for_sale_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/YkEG7jf/advertising_agent_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/JEghieD/mimogubogizigav.pdfIn PDF document text
    • https://todisosoban.weebly.com/uploads/1/3/1/0/131070867/xelaxabonab.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/16fa45afec3.pdfIn PDF document text
    • https://dedolodaramolon.weebly.com/uploads/1/3/1/4/131455072/nizekukubala_nibuwolepixetex.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/chiggjh/battlebox_uk_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juliziwojatige/spotify_premium_apk_2019_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/allocation_chomage_formation_pole_emploi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 4928 bytes
SHA-256: b70aa1a89c221e71ad2909eab57918d5f4c6ef998208fb9ca74a15c8fbd33b8c
font_01_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 11676 bytes
SHA-256: e6877212414e3104ded97920866ca0869d0d6e46f2a379602eceab37e188509c
font_02_sfnt_off00016b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B38 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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