Malicious PDF — malware analysis report

Static analysis result for SHA-256 839a53942179ab35…

MALICIOUS

PDF

70.9 KB Created: 2021-03-01 02:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 80a74ed84ae71860546258201079d6ab SHA-1: 95240e469cb6a291d9bede4a154c3e4e431d398f SHA-256: 839a53942179ab35632beb9a9ea6fbd8dc655ce1defcedbc0bd16547fe4f6478
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-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.
  • 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://baarspo.ru/aws?utm_term=apush+period+review+packet PDF link annotation
    • https://rifojiditesi.weebly.com/uploads/1/3/1/3/131379396/e94f6518fad78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_6012bae33284b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_60322ad926729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471996/normal_5fca598bade8d.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/43df500.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/7hbidgc/sling_kong_characters_all.pdfIn PDF document text
    • http://didazema.mypressonline.com/what_does_crescent_moon_and_star_mean_in_islam.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/gJ62Lha/bridge_builder_adventure_level_40.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/21019d1a6ed43.pdfIn PDF document text
    • https://gajerekore.weebly.com/uploads/1/3/5/3/135327587/8e3299fd4af08.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/rogibisuleniruju.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/teredegelefemuxololirig.pdfIn PDF document text
    • https://lixuzagaleve.weebly.com/uploads/1/3/0/9/130969249/livetiriwilano.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/5008260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fe7f49b8314f.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/8jcjfgd/gemagajodokoximokadolakox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixomirorubu.myartsonline.com/what_is_the_formula_for_surface_area.pdfIn PDF document text
    • http://widusop.atwebpages.com/pobokij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5336 bytes
SHA-256: b3dc76c8411c909c042e5bfb3c1a6e65166e0bc3479f515b66b7078dd7c59fda
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 10668 bytes
SHA-256: f670eec96f8dfb5067a33bab1ced72f17b87bee6bed19a64bb155f6cfdf36bc8

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