Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7a1acc4080e3ab…

MALICIOUS

PDF

87.2 KB Created: 2021-05-22 01:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bcbc04af3bf4e3636eeecc37d758d97a SHA-1: 111cdd939252403ee0deba5909e8bc9675525673 SHA-256: 5b7a1acc4080e3ab207d51ecb79ea77d7ca954788be40c6347665438a7ef6b59
226 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. It uses a password-protected-archive lure. 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 0.9993

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=bohemian+rhapsody+guitar+acoustic PDF link annotation
    • https://dubelife.weebly.com/uploads/1/3/4/3/134379826/20e69e547d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_603f98c95c1a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fdd88faebdac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_6026619501edd.pdfIn PDF document text
    • https://tisemijosugimuv.weebly.com/uploads/1/3/1/0/131070246/5fa0bfcefe87460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_5fd3a4c750b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_601491938e014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373516/normal_5ffc31b1b5ca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fc6dcc897526.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/3358868.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/tozufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5fe127cf1e29f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_60592e22e961c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_6040180da7818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_600017d3515e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_6047a6881369d.pdfIn PDF document text
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/484817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2f8e85-720e-4bb5-bf31-2a53f425e4cf/good_bible_study_books_for_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf29a7a-6805-4163-84e2-4772ef742189/how_to_make_volume_work_on_fios_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39321e7c-3c8e-4551-8900-aa62488d12f4/advanced_dungeons_and_dragons_monster_manual_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a4df0e-8e26-42b5-83bf-ed1c0eebd5d9/mibuzev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed040f7f-bced-450b-b1d3-54b59b438a14/vetolixaborepodagupifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86223d5b-6848-4dd7-bd82-8e07297f7da6/can_you_watch_american_gods_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e93655-f79a-4919-a891-82af2b3eb9c2/is_motorola_surfboard_sb6121_compatible_with_comcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9f321a-8fca-449c-aa62-66d993f243ae/dexekij.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_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 5608 bytes
SHA-256: b51267bf32868d8281a1f27d5c82ca7781ebd31a278b11fbc63c4ea38a08fdff
font_01_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 12284 bytes
SHA-256: af7efa5fa7c49898a1a11196db52b27e728ef1d7d829784ad0595772037c5c37