Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f7b8f1b516d7f…

MALICIOUS

PDF

68.0 KB Created: 2021-01-13 16:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a499ca8123e593d4308f55255d091e9a SHA-1: 2688b1a27675455e039b8cd3636da410eb10a0d0 SHA-256: 721f7b8f1b516d7f6a101b00112eb951bb8f9cfe8620a57568e593ed2ade37db
156 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, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://trafffi.ru/123?utm_term=form+and+space+in+japanese+architecture PDF link annotation
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/995e8d0a88e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f93fd88e4187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5fecec8d7f7f6.pdfIn PDF document text
    • https://site-1212380.mozfiles.com/files/1212380/balache_baap_brahmachari_marathi_movie_song.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/tegimor.pdfIn PDF document text
    • https://site-1174422.mozfiles.com/files/1174422/to_the_moon_gameplay_length.pdfIn PDF document text
    • https://site-1230387.mozfiles.com/files/1230387/wanazijekagabodin.pdfIn PDF document text
    • https://site-1178040.mozfiles.com/files/1178040/coordinate_conjunction_worksheet.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/gitipelut/aadhar_card_application_form_for_child_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/94742504092.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/dotibanimuti.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/57703297612.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/impulse_and_momentum_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/gummy_bear_osmosis_experiment_worksheet.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_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 5312 bytes
SHA-256: 695ba1d3459f9033fed75ff8a203a981273730558d6a6bf4f6bef86a7b5b1566
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 11356 bytes
SHA-256: 6b0e2cb701ab3d8a232e6626c3faa43a7031339d947a8023a052e88f6b431f4b

Open this report in the interactive analyzer, or submit your own file for analysis.