Malicious PDF — malware analysis report

Static analysis result for SHA-256 b243975e15ca2c18…

MALICIOUS

PDF

81.8 KB Created: 2020-12-27 12:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 036e8d95e3e04b8ba033fd5b8d62a93b SHA-1: 08fa25e350cb3c1e801b695178e1531de4386427 SHA-256: b243975e15ca2c18611db5bf831a8f0dc5effd12164fbf0b10e0edcd9cbe9bc8
274 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, many of which point to redirector infrastructure. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates that the document impersonates the brand 'UPs' and directs users to a malicious redirector URL, likely for credential harvesting. The presence of numerous external PDF links suggests a link farm used to obscure the final malicious destination.

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
  • 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://polabufasol.weebly.com/uploads/1/3/2/8/132814050/fubopuvup_zexidesezom_nagorofoze_gidopiz.pdf.
  • 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://traffmen.ru/aws?utm_term=service+definition+document+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fd3bd90a3447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fa461d63f3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f872e2bec18a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8d25ba6c3c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fe1532c7f3b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475985/normal_5fa7311395588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67c7b1800e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5fa0267e554c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbce708ccd8.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/fubopuvup_zexidesezom_nagorofoze_gidopiz.pdfIn PDF document text
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/9322059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f87371204fd4.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/8b2a240e-1f4c-4b89-be22-7b76329376ec/62209099136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ccb5d6-7093-43f2-bc78-f1805f13583c/the_lighthouse_movie_2018_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f1a89d-107a-4bbc-a632-19498a8bf574/fumelivokun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b66d409-aa72-4cce-8592-983aa9441971/48013510813.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_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 5284 bytes
SHA-256: 1b3b4435e1d830127de9f8073e01d9ce8454478a7e568383a5d18c0ff8eac489
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10716 bytes
SHA-256: d3d802d7231c7f865d3ef38c8a4ace621543b255f501f3759a60e323327b2fb8

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