Malicious PDF — malware analysis report

Static analysis result for SHA-256 87053b4bd8689bea…

MALICIOUS

PDF

71.5 KB Created: 2020-12-05 06:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0dd59353291f4ca332132fea32eddfe8 SHA-1: 9bab35950219f1d01f747ca3ccf68b8b9152a739 SHA-256: 87053b4bd8689bea09f638c6b1128f6e1f0fa3b99caf784ca57fcac9f34e33ed
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics for being a link farm and a credential phishing lure impersonating Amazon. The ML classifier and ClamAV also indicate maliciousness. The embedded URLs suggest an attempt to redirect the user to a malicious site for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/gekibakezumo.pdf.
  • 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://trafftec.ru/strik?utm_term=north+face+router+backpack+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8b9732b959f.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/gekibakezumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fab7f5678245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f884ccfb4166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5fac35ab99db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5fb6090315159.pdfIn PDF document text
    • https://reborugavuzak.weebly.com/uploads/1/3/4/7/134736286/6985544.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/0d038d0a280.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/duguj.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/wosutad-gobonova.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/2606631.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/39bf7097-6347-493d-bafe-0c4aa3a1ef16/introduction_to_management_science_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adecdb6-9947-4dc8-9689-fab85bdefa1a/3174653753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34ce68d-2da4-4790-9dbc-88d8eb695700/xpress_redi_set_go_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf351b7ee8e70759d8266/1606218577630/nepuweje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21e2fce462bc8c0024/t/5fc260ae7acac6192a0dbcf1/1606574262413/elements_and_macromolecules_in_organisms_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1271ee-001a-4aab-ac77-205490129440/fopunipuzibe.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 5276 bytes
SHA-256: 3fc1bc248a59fe4b02470e4e9dbb8fd360db02ee79dfeb56cabf9db1cfc35bed
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10416 bytes
SHA-256: 8833bf5cc989ca751f0dd64d3b34f0316590766cb735448c731c1ee004696428