Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf70121a31ac3f3b…

MALICIOUS

PDF

70.0 KB Created: 2020-12-23 05:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd74276b1aeb37d1a726e011f38fd5c9 SHA-1: e1f92238028a9fd51bba9331f38e2408b8d95e66 SHA-256: bf70121a31ac3f3b3b4a60ca6382911c6c37dec5a3d2b24d9a614cabd81f8180
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded URL that redirects to a phishing site, likely intended to harvest user credentials or deliver further malware. The document body, though heavily obfuscated, appears to relate to salary information, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafftec.ru/strik?utm_term=robotics+engineer+salary+range PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fc59a0919f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5fd3d0a87d66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fb7996a15756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5f88144031d69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5fcd75edbe85e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_5fd9335bc742e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_5fd1a11e61d3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0f552951-0553-4a3c-bf4b-67ba6f41d397/62775329829.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/46698639147.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/51651583946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3130093-4dd0-4471-990f-ea8662c4ea53/33406497032.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/54662832568.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 5004 bytes
SHA-256: 9dfa5aaa807fe85d11e91f986ab01aa5965431409d05d4b57de108f30ff270dd
font_01_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 10652 bytes
SHA-256: 01ec1e36039bdbc0fcaa1787748264431544dc42e57a2bae89a0f5c86cbb6d5d
font_02_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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