Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf669339d2a7786…

MALICIOUS

PDF

75.0 KB Created: 2020-12-28 20:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e88acf3b9f950867b57c7255a9d87480 SHA-1: e2299cbcb6c8ec91154f06703c9f296339606846 SHA-256: 8bf669339d2a77868f5b54563f75086414499026b0aeb96526d3f0b5cbc1f9ea
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating a credential phishing attempt. It impersonates Microsoft and directs users to a malicious redirector URL, likely to harvest credentials or session tokens. The presence of numerous external links suggests a link farm or SEO manipulation tactic, further supporting the phishing lure.

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.
  • 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://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/acbc24795.pdf.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://traffset.ru/123?utm_term=messenger+hotmail.com+registrarse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5f9ad0fd43e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fd1c3eec1cc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5fe4948610aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87d27addad0.pdfIn PDF document text
    • https://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/acbc24795.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/9gedHid/bose_colorlink_2_wont_turn_on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369629/normal_5fcf1b89b0907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fc3e5bd04118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fa5558fd9639.pdfIn PDF document text
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/24c1f4.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/sibuwadow.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
    • https://uploads.strikinglycdn.com/files/a7a638ab-23c3-41b5-adc7-03f0c7470007/81316857327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3126cf1a-e9be-45f8-b612-a13244478281/zulejukizugopa.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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 5036 bytes
SHA-256: e2e1774962d29ff2dd0d464c430fe35fb9f83269da987e88d79a974fc375e281
font_01_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 10420 bytes
SHA-256: 04e2dd27f4b25b0d2a2874fabcce443e299f1ee3d6f66ea7644bc3f13f7fd27c
font_02_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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