Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88eadcbec4b267e…

MALICIOUS

PDF

66.3 KB Created: 2020-11-17 04:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1a28d9e0741a23e5b8003524dd98dc6f SHA-1: 54cbac3547db435d807166ab5c1deb71f04b6f96 SHA-256: e88eadcbec4b267e766792e83d822af5c4e5e5a6077835c9700f9b8eb1a83a7a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm used to obscure malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=nissan+50+forklift+manual PDF link annotation
    • https://jogapemufa.weebly.com/uploads/1/3/4/4/134492880/gineparedinakikijime.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/9195651.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/tezofuretejom/ledomuzumuzexaribog.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/19734306629.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/jifake.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/tofuri.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/80891446105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b93e1c8-b366-479b-b28c-d6752aa3e4b8/kenabikuvumov.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/37806782280.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/super_mario_bros_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2bc73f-c9d7-441e-80cd-7b3e3c3672b8/87355966139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc16c6-4a7b-44c4-ab0e-8319080a6095/72535453316.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/bureaucracy_in_hindi.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_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 5212 bytes
SHA-256: 85a76cbcb42edb7e2776e5eb15fda37dc8243d2e8e56a01f07cbbb9dd26aa01d
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 10508 bytes
SHA-256: d8311bbe62af0c3e223106ab93802e150be6e6057e66df7dd2ad175bb7278cdd

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