Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff711d113c1fdef…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 18:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2591e2f745edec5f4058ec0a7cc51450 SHA-1: dc82cd41ae26c3041467bc97c3262eda9e800941 SHA-256: 4ff711d113c1fdef2712df60a8c2bb48698d7b73ebf67c3800b4307abf6c709b
186 Risk Score

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 0.9989

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://pelibifir.ru/strik?utm_term=printable+ancient+rome+worksheets+pdf PDF link annotation
    • http://jujusojuwax.22web.org/47504965317.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/48c5ac0816564.pdfIn PDF document text
    • https://narusipanunajix.weebly.com/uploads/1/3/1/0/131069819/8597018.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/92018395765.pdfIn PDF document text
    • https://mogasijukunuv.weebly.com/uploads/1/3/4/0/134042787/9914119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5ff25eda96087.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/cambridge_advanced_trainer_vk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6025719bd275e.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/adobe_scan_to_paper_size.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/ea83c3809155c5f.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/fodometefibajiduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/51845797015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a8d962-a327-471d-a8da-c7987ea398f3/xojevimukigoxutawazovopix.pdfIn PDF document text
    • http://xagexof.rf.gd/single_phase_and_three_phase_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca01f962-5c7e-4f23-893b-48b6b3deb0d7/sajumulifanafaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b12a974-db85-45d9-9da2-1edf91f207b2/70405585448.pdfIn PDF document text
    • http://zurekenalemone.rf.gd/management_concepts_and_organizational_behaviour.pdfIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_b44ce522afcd4d4e8037c4e219904ea9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f45262-d8a0-4fa2-be33-45a0cf63f339/85275648173.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_c07eda715d9e4422bee574c94e9e74ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5ebfca-e4c9-4b7d-aff4-9a4a50d89a06/nkjv_bible_concordance.pdfIn PDF document text
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_3166ce944a9e4aa5bedcd64957b619b2.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_3a9ec9661e314c3f904cdde6dae22607.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_a91d311f47e444aea3f0ef3aacf8b233.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 5480 bytes
SHA-256: c8a40176efa1ff4fe67fbba27f05ef3440a76c46face18392e5bc62c6b24a430
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10052 bytes
SHA-256: cb05f9582eaf97638b86ed33be6fbbcee934f2061399ef86caccaf4ee4bb62b3
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34