Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a07540d55f22cf6…

MALICIOUS

PDF

68.1 KB Created: 2020-11-09 22:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 941bbcf1597648b20baf823cc01bbaf4 SHA-1: 19bfccea1de5bab47318cb5ad41c917b07c758f4 SHA-256: 1a07540d55f22cf6e8ea1df671d6e125d28e11b4f32fa9b4dc08076bb8881301
314 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link

This PDF file is identified as malicious by multiple heuristics, including a critical finding for a malicious redirector link and brand impersonation for credential phishing. The document impersonates Apple and uses a lure related to resetting security questions, directing users to a malicious redirector. The presence of numerous embedded links, many pointing to PDF files, suggests a link farm or redirection infrastructure designed to obscure the final malicious destination.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://wegonugu.weebly.com/uploads/1/3/4/0/134040733/179152.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
  • 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://traffking.ru/123?keyword=can+t+reset+apple+id+security+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f98e83303c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467030/normal_5fa77f3b013f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5f9ea1d3eac60.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/179152.pdfIn PDF document text
    • https://pipomojum.weebly.com/uploads/1/3/4/4/134437532/6527929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8ea7f03ff32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5fa335e649f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8957e69e8f3.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/16834269-973c-4b6a-98e0-3dc1dc099eed/85754503651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0449ba80-2533-45d1-b0de-230f28719afd/national_mah_jongg_league_rules_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55da9a3-29d3-4a6b-9220-383420cf86e6/51387001083.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/78964787913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a9ef54-4a7b-4c25-9beb-88d413983880/85295128169.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/watozigosiju.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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 5200 bytes
SHA-256: d5a3f1985139580191d3cfe09d45ce40e30fac21be2d1c3a731ee466ac49b143
font_01_sfnt_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 10788 bytes
SHA-256: eba367bf699c52b6363ebe542454c3ba06063bfd342b0493b5f1738e3c30e4c4

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