Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57ab7c20cce3a42…

MALICIOUS

PDF

73.2 KB Created: 2021-03-19 13:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2b93b4c5511eae9c959dad962d03da90 SHA-1: 097cdb4ed6bab17a36e08a18b1256168ceecba2b SHA-256: c57ab7c20cce3a4208b675e5116df101bd9de8e0ba365ae9f645c38226a53037
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to "Addams family theme song sheet music pdf", which is likely a pretext to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://bologen.ru/award?keyword=addams+family+theme+song+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/gezefesete/QjeBhhh/importance_of_sleep_worksheet.pdfIn PDF document text
    • http://elinekici.online/the_armor_of_god_priscilla_shirer_free_download5uatm.pdfIn PDF document text
    • http://faceit.su/nonijonosowu0wmkg.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/bijFMig/auto_clicker_automatic_tap_5._1._1_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/iggfgih/53084413409.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/heILgfy/how_to_make_resin_knife_scales.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/20041887887.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/ghfyarl/jofibidikaporozakez.pdfIn PDF document text
    • http://oblakova.ru/las_cronicas_de_narnia_46rtv0.pdfIn PDF document text
    • http://trickyturkey.com/what_does_lucida_meanto5mg.pdfIn PDF document text
    • http://prostotit.site/air_force_1_black_and_orange_jd0l91t.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/djiiiV2/nonirevebozoxuvirejudem.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/aiiHiGT/2369782335.pdfIn PDF document text
    • http://folejaf.mypressonline.com/julujuvamefekakepixuxina.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/ShglifZ/48592700855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_4d608ae0650b49d4984b0de91bac6435.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_82f3f13aba574767ba4a91ddb80df7bc.pdf?index=trueIn PDF document text
    • http://kututugijama.epizy.com/jerovejeji.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/40069332971.pdfIn PDF document text
    • http://benepuru.epizy.com/florida_warranty_deed_form.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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 5564 bytes
SHA-256: 0d413abefd3a940fd299cbb3ff7c18be25ff51eaf0f424926afd670913fa11ce
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 11544 bytes
SHA-256: 6fd286d66e0a542f7abbff0e31daf60d1354d9011221a85e41030445bc432e94