Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c8f472bc6e3585…

MALICIOUS

PDF

82.9 KB Created: 2021-04-08 22:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae5a75edf3912e3fe43bd0976339d037 SHA-1: 10249ae7ec8f775e53a115f9e0cb91ba90380119 SHA-256: c0c8f472bc6e3585ab976b2b8ae9ca512ae4cdf9ce300e7331924698891dd447
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 0.9997

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://seumenha.ru/strik?utm_term=verizon+fios+modem+login PDF link annotation
    • http://lazakefezives.mygamesonline.org/dersu_uzala_vladimir_arsenyev.pdfIn PDF document text
    • http://webdefilmizle.com/ny_state_2nd_grade_math_standardsb8zya.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/welding_engineer_interview_questions_and_answers.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/zitimazalenemupibadada.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/wijomurarikema.pdfIn PDF document text
    • http://dejasis.iblogger.org/2019_amcas_applicant_guide.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/3192834438.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/78383495415.pdfIn PDF document text
    • http://clebohets.xyz/skyrim_fix_mod_load_orderhiemi.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/psychoanalytic_theory_examples_in_literature.pdfIn PDF document text
    • http://okstore.info/beautiful_redemptionyr24u.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/boy_scouts_popcorn_order_form_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikilodi.epizy.com/price_rosetta_stone_russian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113409b3-f315-4a24-baeb-eb10b47c6fbf/sifegosojejomefapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77716f83-ca55-4e4a-a242-ad8418a4fab5/the_beths_band_facebook.pdfIn PDF document text
    • http://domusas.rf.gd/quiroga_almohadon_de_plumas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06346bde-59ea-471c-8887-d13f5a732829/the_leftovers_reviews_rotten_tomatoes.pdfIn PDF document text
    • http://dujizadixupodur.epizy.com/how_do_you_read_a_plat_map.pdfIn PDF document text
    • http://mitefunigesito.rf.gd/4516077587.pdfIn PDF document text
    • http://tenefotozefuzuw.rf.gd/73552275832.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_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 5032 bytes
SHA-256: fe2732925f1daee44967809ce9ca10df0a38c66df2187dcc511d3311aa28592d
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 10880 bytes
SHA-256: 66f9f16f4dd74e22d3e91538684090d23aacb87fde437d16c156c23c08a91070

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