Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d878941f44ae6a3…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 22:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 015d540de0cfacef27c5aa3d7baee84e SHA-1: 88b908b4953158b2bfa99b88be8d725849cef4a1 SHA-256: 6d878941f44ae6a31a8fe3e53a303a55eafd4faea2d7f82a3e93234ec17facaa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'performance objectives', likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=what+are+the+5+performance+objectives+in+operations+management PDF link annotation
    • http://vykupavto54.ru/how_to_write_a_good_travel_storyv0wol.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/rxgfjb6/monster_car_hill_racer_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5ff75a6a2f1f4.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/gikgg8V/smile_one_coins_top_up.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_600e40b823216.pdfIn PDF document text
    • http://alcozerox.com/92794717673k7kqk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600e4cbb1f06a.pdfIn PDF document text
    • http://wenijivi.iblogger.org/35972892873.pdfIn PDF document text
    • http://1fps.ru/779424751045swqa.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/ehbEvbX/hair_clippers_and_scissors_set_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452206/normal_5fcaf53acef22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_60063d4ef157c.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/ggEihvO/16451234487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454424/normal_60051f3228115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_603fce732983e.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/Shahijj/number_plate_check_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekelogamaju.rf.gd/33210931491.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/vasajomiwivena.pdfIn PDF document text
    • http://defujusavoxo.rf.gd/glencoe_health_answer_key_chapter_19.pdfIn PDF document text
    • http://vezufokat.rf.gd/nijixupojijos.pdfIn PDF document text
    • http://karuserewojax.epizy.com/electrolux_vacuum_cleaner_service_manual.pdfIn PDF document text
    • http://femejedad.epizy.com/14865633878.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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 5808 bytes
SHA-256: 588afcda12863b012d38b89590dd6da26ca0046413a25cf9f3678ebccae0cec8
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 11764 bytes
SHA-256: 98d5c81c3bea0651644ca79903c5f5569d80dfb332a313d6ffe7004c24c47514

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