Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cf471116f7717d…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 08:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 47b763e1895c2ed766b82c94106efe50 SHA-1: 3e15551ece61e1824ed7db182ecb701bb9004bc1 SHA-256: 43cf471116f7717df3c8533d0abd6d95349e4e66e7bf1b879051eff59cc5dd47
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://ponafet.ru/wix?keyword=night+comes+to+the+cumberlands+sparknotes PDF link annotation
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/fc4dd6a.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/ripafizotatejomu.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/dowur.pdfIn PDF document text
    • http://kexumojazo.mypressonline.com/cdr_for_engineers_australia_sample.pdfIn PDF document text
    • http://medyayazilimtr.com/english_grammar_lesson_101ut59s.pdfIn PDF document text
    • http://instasale.company/how_to_reset_a_kwikset_digital_lockwoq6q.pdfIn PDF document text
    • http://psylath.com/warfighter_exercise_definitionnen8t.pdfIn PDF document text
    • https://sevipopiwipuf.weebly.com/uploads/1/3/5/3/135302768/werenipuzozuk.pdfIn PDF document text
    • http://khanapoorti.com/320925753rvulp.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/degofegasufidu.pdfIn PDF document text
    • https://ruzipirufevet.weebly.com/uploads/1/3/4/6/134667542/1546181.pdfIn PDF document text
    • http://opensoda.pro/what_are_complex_carbohydrates_and_what_foods_can_they_be_found_inldt5u.pdfIn PDF document text
    • https://kujuroledok.weebly.com/uploads/1/3/4/0/134040703/1187736.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/how_to_make_mosquito_killer_bat_at_home.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/sadepiwugebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://farovosodiwes.atwebpages.com/cisco_ccna_routing_and_switching_200_125_portable_command_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/gepet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818c0a5f-9bf6-4f61-ae48-e427dec6d175/can_you_make_smoothies_without_blender.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/beyhadh_background_music_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc1b7cf-0eb0-4339-a9c9-7c9eef47d1ab/11111161491.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/lojepinaluwur.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/70841702925.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_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 5660 bytes
SHA-256: 44f2189bfc1b8baedad1f36492b2fec5415b3d1862fdbfa4a6390ab37b5dacf9
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 10468 bytes
SHA-256: b54da77e57f896e0810c1b7503536c6dd737c2e4913bb4127bfaec7b5c286439

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