Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b4e92279019963…

MALICIOUS

PDF

69.2 KB Created: 2021-02-28 16:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 15d0536501665cedca19a870df108dda SHA-1: 1f1ca613758f0e8c11c3579db428d605973433fe SHA-256: d1b4e92279019963edeb9fe986c08feac619b2ad4a902cd4c7e9dd7e1450b666
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://golowaki.ru/wix?keyword=lewiston+mall+maine+hours PDF link annotation
    • http://rumurel.mywebcommunity.org/audio_driver_for_windows_10_64-bit_-_lenovo_g580.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/30_day_muscle_building_workout_plan_without_equipment.pdfIn PDF document text
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/xifexufuvox.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/microeconomics_book_class_11_sandeep_garg.pdfIn PDF document text
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/zowazozi_volagimutilajow_bilebumafixo.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/vixolin.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/vafipafoxefokenasa.pdfIn PDF document text
    • http://shishkin-seed.xyz/kuxavoxodinugefaswle4q.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/lopujebufetese-vewikumubuxul-dekifexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/titugome/66984418274.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/clarinet_sheet_music_for_intermediate_players.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/acronis_true_image_2013_bootable_iso.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/zibibumubida.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/the_forgotten_way_dekker.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/56312816906.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_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 4956 bytes
SHA-256: 04a79ecec397b86b4c9ecc9c200aa8378adc5842c79f00136c570790e0a4c795
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10200 bytes
SHA-256: d2a9da5b8c7922d0869cb4282cb0e35349a092e555b0da0150c305aa7cfa3554

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