Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1842e4facc106b2…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 05:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cc42d9915afecc809e003313c3de6dc9 SHA-1: fba8b82956dfe4230b628c984f1332c27266f71c SHA-256: a1842e4facc106b27ad070e7f1b0ecf60859b7918999143e9dd35cb8574f6437
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://bojufare.weebly.com/uploads/1/3/1/0/131070992/5f992dedd.pdf In PDF document text
    • http://tumbochka.space/59885859753847k7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fe2c89ab45a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_602dde4e70f4c.pdfIn PDF document text
    • http://fortuneocredit.com/16495253547g65gi.pdfIn PDF document text
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/fe1b9000fc1a91.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/718f94e37911a.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/3905969.pdfIn PDF document text
    • https://xavagozewurele.weebly.com/uploads/1/3/4/5/134583143/1105802.pdfIn PDF document text
    • http://yourdesk.website/whirlpool_duet_washer_inner_drum_replacementyeiej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_601edcda69ff7.pdfIn PDF document text
    • https://kuxesilivalagi.weebly.com/uploads/1/3/5/9/135963561/f17500.pdfIn PDF document text
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/kapagim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ffab03b3a5cc.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://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=cuckoo%20clock%20repair%20shop%20near%20mePDF link annotation
    • https://uploads.strikinglycdn.com/files/92790828-2d56-457f-82a1-ca632660f542/easy_reading_comprehension_worksheets_for_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2320459-54bb-4d92-a4ab-927c380bb80c/tadusolenudapuzuvadeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dbda3f-166e-44db-917a-412907c7ca0d/racing_rules_of_sailing_appendix_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0e6353-a99c-40ba-a821-4cad0c67d1fb/93048521410.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5060 bytes
SHA-256: 0fb1d818f6e5b4c88118f48228e5569b209d917e453cd7f489695f0cbe12fc0e
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10464 bytes
SHA-256: a1e2390cdbb5e2e0ab41905e1f9533ca173ec64dc28003c095ce3ca7bf53c643
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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