Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f70e337bed8c891…

MALICIOUS

PDF

86.0 KB Created: 2021-05-19 22:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0e8ffd41ecb3118ee18cd29195f5b64 SHA-1: ed445634fbe260c713a8c6cd6d6ae7e34e32b573 SHA-256: 5f70e337bed8c8913165859243cb3b69af3798957eabda424fd39ac30bc66d24
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=red+star+over+china+epub PDF link annotation
    • https://revelamedif.weebly.com/uploads/1/3/1/4/131437508/220538.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/wagawugorenon.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/527ba9520692.pdfIn PDF document text
    • https://gimatiderimu.weebly.com/uploads/1/3/4/7/134774165/7771153.pdfIn PDF document text
    • https://vafubetuxako.weebly.com/uploads/1/3/4/5/134503762/0605c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_60581df427f2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5fd7d627b2c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_6066409a9a848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5fdf20fad1053.pdfIn PDF document text
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/surubewuzixuji_bakijedobovej_dikidagot.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/747862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/xemavumukukogelaxano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac8595f-61c3-4627-b5eb-0999085ffb95/tiriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c1ff7e-f4f5-478a-a10e-952688bd62f6/astro_a20_wireless_setup_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/what_happens_at_the_end_of_atonement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52347efe-4546-40aa-8511-cf263655efae/facebook_account_recovery_without_code.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/is_cissp_hard_to_pass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75da325-78c5-47e5-80e0-c631a88a3f7b/31837700176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e4ce3e-e7c5-4dca-a0dc-ccc70be431d2/class_5_math_book_2020_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/2005_cadillac_sts_transmission_dipstick_location.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 6764 bytes
SHA-256: b57ac7850bd206ab5ebcc197c9b7375841d43f3185f4553007ff22ec9aca5814
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 5336 bytes
SHA-256: c87d1a4638f04001e844ae5cc7d23c02a7d4b4aba4717a09ea61057e7dcd4478
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 10624 bytes
SHA-256: 6481f238a330fc36077eaf7b3db2e40c8ee091633d821e1ad19675c2a3f90269