Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4a368dbb636e31…

MALICIOUS

PDF

77.5 KB Created: 2021-05-26 18:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 1911f5d9bdd50b9a2343f42669839c38 SHA-1: 3469ad7cb0bcc22a307e0a33151d8a806a7b3560 SHA-256: 7b4a368dbb636e31b4220de49638ea3bb47401fe66bed03ad669651fba5c3ad9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, indicating a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to a multitude of external URLs, some of which are hosted on disposable domains, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://static.s123-cdn-static.com/uploads/4405654/normal_60098cf776bef.pdf In PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/zijava-xaraxujub-nixurexexatiki-rarinakeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5fdae89adc1f9.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/e1cfc09.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/movitolizifumep_jogoxadexipu_jalelozejebopoj_vuxikav.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/gudaj.pdfIn PDF document text
    • https://lokenomosotim.weebly.com/uploads/1/3/4/4/134499182/8128500.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/roneke_setejulalesan_nivakan.pdfIn PDF document text
    • https://dukupifit.weebly.com/uploads/1/3/0/7/130775427/pakizineromodo-duxarewinep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=roald%20dahl%20kindness%20quote%20printPDF link annotation
    • https://uploads.strikinglycdn.com/files/dd9e7cdc-7da5-4d59-a282-1db11b272847/entry_level_technical_writing_jobs_seattle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47df635-4e84-4fc3-873d-d19d769d4e6b/malofidokuzagaxola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4c7661-c308-4508-92da-172c223b76ae/dotnet_core_interview_questions_for_5_years_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c8c9e5-c5d1-468b-b49a-f1828a6ecae3/46271092840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b729a67-4ac9-44fe-b4f1-729ed246c455/90596314840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01fe842-5f0d-412a-bb1d-83a9cf3e6166/what_does_the_trop_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5f0ef2-1231-4e16-846d-9df669d2225c/dune_board_game_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc72c4a-b7da-4fb3-a43a-31cb17449b93/how_to_reset_my_jawbone_jambox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4359bf-b4b4-49b2-86cd-7048f62409b0/spanish_to_english_dictionary_online.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_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 5244 bytes
SHA-256: 250896046bddea0e7b1fa51b4ba142de4ef90bd4b566c57b7b20e5347120b835
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 11272 bytes
SHA-256: 70f7de2ffb05c50e5fdb5b23119c2b7dfab6656933c7c4ce0b8fe4abee0d5a8f