Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c43daef43c1533…

MALICIOUS

PDF

79.1 KB Created: 2021-06-02 21:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55b8a8dac978e0b400b82e885f0e4771 SHA-1: 1a765e764171103dbecbe626cf0ee4ee092aa6bf SHA-256: 11c43daef43c1533627e7762d6a5c8e50df3f0bad1a74ccac35f3c291d418048
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/123?utm_term=6th+grade+earth+science+worksheets+pdf PDF link annotation
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/tunifupelomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_606e1f7f8b814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_602bad089eb7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_603c4b92b12b8.pdfIn PDF document text
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/4e96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_6065062e108e9.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/minegolaxesewit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fdd8a712cffc.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/5314594.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/rukuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_605b4d2154943.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/4451688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5feba413b6edf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfc3f9a-5583-4640-9e6d-394817dbf39e/rinajapirirasuwunuradij.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/how_to_adjust_husqvarna_zero_turn_steering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a72325-2ba2-4d8a-a391-56dabf8776f8/evga_gtx_970_power_connectors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a623b1d7-1c51-4aad-a531-953e6dcdb847/naxozeb.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/dufokusuwojuni.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_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 5600 bytes
SHA-256: ff29d6542b4a0399b31c456d3fe4b923c186a1856f89094e0a6777d3da1d2bce
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11008 bytes
SHA-256: 3781555a33896f27ea0cb6e210cc0aed5a592f056a489f5440c273a22991f1eb

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