Malicious PDF — malware analysis report

Static analysis result for SHA-256 593bf0dbe4d33971…

MALICIOUS

PDF

71.5 KB Created: 2020-11-25 22:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f2fbf3b5e27ad65b69eead1f2d87fdc2 SHA-1: d8a5d1c7e05cdf4edae899a09605e013e48fbac4 SHA-256: 593bf0dbe4d33971fdc600ba7a07ffa31b098f2c08b0131e20a77708df7d1aae
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, and is flagged by multiple heuristics as a link farm and credential phishing lure impersonating Walmart. The embedded URLs and the overall structure strongly suggest a phishing campaign designed to redirect users to malicious sites.

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://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.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://trafficel.ru/strik?utm_term=skam+france+season+3+episode+1+english+subtitles+watch+online PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/ad0f802c3a9b.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/3451839.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/7237958.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/menedo-fodizelusekom.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/6128b752-75e3-43ee-ad4d-7ad6f6679f6a/dawalumebovunokefikifup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25fda6b-7afd-4003-98b4-10fe9517c0a4/41526049263.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/wuzolok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05806213-f682-4742-8350-e692435b32fe/vepazebexilixosugoko.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/wugineniworuza.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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 6184 bytes
SHA-256: 80f42f52b8f5fb4df137dd9a091cb72dc3c9311cd6bab8f9b5c5a8ee0dd3cb60
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10496 bytes
SHA-256: 122ef88a2213f18be2a3c62d7144f8b145d22d958eefd3fdee0e1279449617e5

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