Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b06affc590b8e07…

MALICIOUS

PDF

91.7 KB Created: 2021-03-19 14:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00083984d354e9417069fad515e04782 SHA-1: ed98a50e646d9501a3d4afadc184e6f23748273d SHA-256: 3b06affc590b8e07f449dd38ea261ebc7aebf78577cc037f8a0cf89a60654c95
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with 30 external links, many pointing to disposable hosting, and one primary malicious URL. The PDF's structure and content suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=beelzebub%2527s+tales+to+his+grandson
    • https://cdn-cms.f-static.net/uploads/4417426/normal_602c592e8cedc.pdf
    • http://regsenatvumen.website/70192611589ab9xa.pdf
    • https://cdn-cms.f-static.net/uploads/4383689/normal_6047d43fc2cac.pdf
    • http://hookup157.online/woxub3t5m4.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_600f30377ed4a.pdf
    • http://okrasote.info/durinerozisavig7pcb8.pdf
    • http://harkateine.fun/ross_carbonite_black_solo_tutorialvwggb.pdf
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fde42963b339.pdf
    • http://sokfresh.fun/how_much_is_a_honda_civic_replacement_key3kj4r.pdf
    • http://bitsracing.net/gewevudoputelapukinemewb2x4m.pdf
    • http://strahuemsya.info/gevabonefuzawuwigodifnifsl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4baa1bea-fea4-4ee9-8653-7fe9d06eea30/how_to_change_the_code_on_a_kwikset_powerbolt_2.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_e97dbf1cddac4ad4863fa20576a2fedc.pdf?index=true
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_0bb4ffdd727d48878e5cb1346b5d7b7e.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_473f29886aef4cb68059fd62fe852ef0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f01923f-c003-4001-8c2e-d3fe8e91c0c7/gozuzubavolenawop.pdf
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_707e0d75099740129c06f97f3da55254.pdf?index=true
    • https://uploads.strikinglycdn.com/files/231210a3-3a84-4937-b1f4-1bb368cd4e75/wu_tang_clan_american_saga_episodes_list.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_9c9851ec53e24e43a2a481c4a09b89ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dea054ea-e6ef-4b1d-93ab-08b87bc4deda/char-broil_performance_4-burner_gas_grill_-_stainless_steel_reviews.pdf
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_7b380104a51c4eb69f5b779593d37935.pdf?index=true
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_74ca0078592d4daf846aa81ce2944f59.pdf?index=true
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_b7a0cf6f5400440c8be98d0141791bb1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011204.bin
270d5c2787048a9190aa03a8a5acfdf05a79e8d7517be2f0270c6c407bf50ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 5360 bytes
font_01_sfnt_off00012441.bin
a03e88ad81b0981552397412c8a5388a7de6e567956b5d56515d96efa7e251db
pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 10756 bytes
font_02_sfnt_off0001499d.bin
2c25fca7ecb4716ea63bc05ab3dd1966081ba09f1f6380a610386a5b5e8c298b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1499D 16544 bytes