Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3441ada1d28a349…

MALICIOUS

PDF

73.9 KB Created: 2020-12-15 15:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1049e0b47a3c3841844fb77022af6f5c SHA-1: 2f1a1e78db76130d9e0f918ec7b4b1794be94182 SHA-256: a3441ada1d28a349e8cf692ca5a0483e7051552c7a493de76b0eebdd2ce85855
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, forming a link farm, with one prominent URL being traffffset.ru. The document body, though heavily obfuscated, suggests a lure related to 'outdoor thermometer clock', likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=best+outdoor+thermometer+clock PDF link annotation
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/ee311.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/pedetuwevutaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8c0279b031c.pdfIn PDF document text
    • https://lokaxanexu.weebly.com/uploads/1/3/4/6/134638146/02984ea46e381ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f917411c8353.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/cb300182-64fe-46d8-be7f-056dbf0b9c18/47321111443.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35e7e6b97992eb56ba18e/t/5fcf7e0f0496d067bdd543d3/1607433746260/85119000011.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc707e8f59f035d0ccacbcf/t/5fca93c367453b32ebb7b440/1607111620090/78781847415.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/zenotonokapis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4deb9f7cf8c7540443e1f/t/5fce5146fe657040d5c230c9/1607356747922/tujemotarubewazatetejaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef456a371610b8762f42/1606217542730/renixozosokilap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29692275-a75b-4d09-9de2-a807adeded95/l_art_de_la_guerre_sun_tzu.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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 5084 bytes
SHA-256: 97e83f22655f23b99ee92c7453a07cecd66ec9f2bdb96d133439b6a1264e662c
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10720 bytes
SHA-256: 0516c5adeeface35d83105d94d61f302e535ab78f9987869bb456c112ee18a2e

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