Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a01f2c093bcba9…

MALICIOUS

PDF

68.9 KB Created: 2020-12-17 12:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ee7a3783773bf92b08bec5236dcd1578 SHA-1: e188da6153cd70261683de7744ed93943322db4e SHA-256: 94a01f2c093bcba9107ad450569550a0a463aee1df5a29eb1282e034a69aa599
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a mass of external links. One of these links, 'https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/d4ddc6d73.pdf', is part of a large collection of links. The presence of external URIs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or distributing other malware. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=cheap+v8+cars+for+sale PDF link annotation
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/d4ddc6d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5f8a488e1ca20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_5fa1a731b1ae6.pdfIn PDF document text
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/wapitalakaluxat_dejibobu_vumekirajivuni_nujopozos.pdfIn PDF document text
    • https://xikefopu.weebly.com/uploads/1/3/4/7/134748362/piluwikojarowaj_nemebarinof.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/petefetup.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/gupuso/strength_training_anatomy_third_edition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce586c56a976706ec757ab/t/5fd65056de5b1220c028512c/1607880790694/25697669209.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc17cd088c99b6d37ab4e26/t/5fc741f90791337046e18843/1606894074177/dropwizard_logging_format.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b03bbd14ff0dd2a824dd/t/5fc5199b3485235c8668339c/1606752669083/soot_bull_jeep_bbq_house.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13a23affbf90a66eca3c4/t/5fc428ee3c6ccf69f3e22d99/1606691055262/77584900185.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b7ce60f2895dc108d09c/t/5fd63b07ab777271768985e9/1607875337392/lixexika.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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 5260 bytes
SHA-256: e091a22c139a38f9b78b0960cbe33ffbcf2ab592aa90cb3d6252ba42fac30cc8
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10680 bytes
SHA-256: 7482276a6f241722c91a81deb7b5de9d45ae5c5f09d16bdf8da4eb5092afcdd2

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