Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd7293bdf86a29c…

MALICIOUS

PDF

77.1 KB Created: 2020-12-27 16:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2eb934b37d8ce5d5a05d57d50d77bbc1 SHA-1: 1faea14e5f92417cd829a46e0ac87da6d88e146a SHA-256: fdd7293bdf86a29c24f68e73fe312c8685671eee05c0b4f4ff4c1186cc898189
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs points to a suspicious domain ('trafficel.ru') disguised as a game walkthrough, suggesting a phishing or SEO spam lure. The presence of multiple S3 bucket links, some flagged as benign and others unknown, further supports the link farm hypothesis. ClamAV detection and ML classification confirm the malicious nature of the PDF.

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://trafficel.ru/strik?utm_term=skylanders+swap+force+wii+walkthrough PDF link annotation
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/rululavof.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/9811865.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/pazovugal/nogunupelepo.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/vudobojefu.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/88388845315.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/lalavegutafakajivadiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138975cd-b582-4ced-a9de-35a9118d417f/senopinu.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/radexukiferewujusulinivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff62e9d9-4e49-44f6-a471-3b81e3007d07/mulisakelosuzev.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/chernobyl_netflix_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/fugijowa.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/remijuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee05735-6729-47b6-938a-882b0666e6e8/javagumoladogexosavolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f50ed50-0e4e-4ee2-ac0a-aebd029d7abb/osburn_matrix_wood_stove_reviews.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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 5776 bytes
SHA-256: 92862aa5df0883b9687d8900655aba3c3c6f5e68de093796dc06933a29498911
font_01_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 11824 bytes
SHA-256: e4e7c6f80e7e0b9c5df0862f7f9694d1716c36437a2e5f9cb22d8ec17074c635

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