Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4a288e886e4373…

MALICIOUS

PDF

75.8 KB Created: 2021-02-24 14:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 97a863207550f70d7688542c5b8ec7f2 SHA-1: 9ab72d4714911f3c8f808c31a4bdbe6645a0e226 SHA-256: 0a4a288e886e437379a608c8820ac2202080aa9bde9f395ce9f65f97d4210682
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and includes external URIs, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful websites.

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://bologen.ru/award?keyword=graco+milestone+all-in-one+car+seat+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408587/normal_6007386a090b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_601c9dd236b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_6012905ae126b.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/cb468fef117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370285/normal_6004ebafae476.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxegejedak/jhxjegj/80029663915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/how_many_pages_are_in_the_maze_runner_series.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/xurewul.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/vpn_apk_for_mtn.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/fisosapuwisetoro.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/28695210757.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/xosadoxitafu.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/duzojusuwonulavak.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/free_joint_ownership_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/kusot.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/wavepad_apk_pro.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_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 5008 bytes
SHA-256: 200b9cefcb856adb87ea3c59628364e2b39e00610ea4d5375d3a64508f87c3bf
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10332 bytes
SHA-256: d5e426741a20cc63d90f820e4552648de39ddfa0730de3046fe18c5e2ae102a6

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