Malicious PDF — malware analysis report

Static analysis result for SHA-256 a796e646ae0cfd7c…

MALICIOUS

PDF

71.4 KB Created: 2021-03-22 00:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fc328ec0095fd3e01b3c40573f995bc4 SHA-1: 1140a4c9d6567a4435229454957d076be305f3d3 SHA-256: a796e646ae0cfd7c03a6bd41c85143199c3a44a1947af2ed2235707cd7f55e7e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=autonomous+vehicle+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fe2b7a24778f.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/3384084.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/bie2ja5/zarebududux.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/zogesug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_6057c2fe938a8.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/2014_buick_verano_owners_manual.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/949e7fa72.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/bosejukuda.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/uggaxib/maxopunuraduse.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/eKjh0If/pottery_barn_christmas_stockings_personalized.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/Z6pB4u0/dungeon_hero_raid.pdfIn PDF document text
    • http://rovolimobu.iblogger.org/dudubulojip.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/nasebidigaduxivaxa.pdfIn PDF document text
    • http://lokofosod.iblogger.org/50104839064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixonuw.rf.gd/solution_set_of_the_inequality_2-log2x23xgt0_is.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/maha_satipatthana_sutta_in_hindi_free_download.pdfIn PDF document text
    • http://nitusubor.rf.gd/smok_devilkin_user_guide.pdfIn PDF document text
    • http://rupemogevewis.rf.gd/charter_ref_code_s0900.pdfIn PDF document text
    • http://tirujukixiw.epizy.com/boy_scout_webelos_uniform_patch_placement.pdfIn PDF document text
    • http://zanatibagewo.rf.gd/assembly_language_programming_books.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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 5440 bytes
SHA-256: 0308179b57ee083c2d47015748a610c042e59e4d3b7afcd496eae2f19931c3d6
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10792 bytes
SHA-256: 772ab3b2c50f6ae5a2c3517c5e8197569df71b734441518a86171b8c84ff186b

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