Malicious PDF — malware analysis report

Static analysis result for SHA-256 41342b1e54f1dd91…

MALICIOUS

PDF

73.0 KB Created: 2021-03-12 07:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 88509406a19de6c92fe12732d5435672 SHA-1: 9caa1d5ae0c0da640adc050589aca573b0b166db SHA-256: 41342b1e54f1dd917dbea4aca8731f51bbfb23114245af09c40a7e1631b687b2
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://nipisod.ru/strik?utm_term=is+a+convection+oven+worth+the+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ffb43e134650.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/tokodokupir.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/jemiretolede.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/e5Cjcgc/orbia_tap_and_relax_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/IVghQ1H/98354351061.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/XbhdgiV/legend_of_dragoon_character_guide.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/mozimozefixusativ.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/qjfsggY/ponaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fd83e5f7719b.pdfIn PDF document text
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/2160096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5fd064f9728eb.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/ggDWUgp/juegos_de_crafting_and_building_para_pc.pdfIn PDF document text
    • https://setijuxuzazoba.weebly.com/uploads/1/3/4/5/134500005/vusokin_gigapaginijadop_suxewekadalurop_feduzewimadeva.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/bU2hbgf/metobidawurogijujar.pdfIn PDF document text
    • http://tuvolabuzibode.iblogger.org/vixotenitexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezanigevuxuso.rf.gd/how_to_write_an_evaluation_for_your_boss.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/xisibugujigukufefevor.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/dewolavozasa.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/fuel_consumption_automatic_vs_manual.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5080 bytes
SHA-256: f164870e438eb1c5853f0fe60e9b31c140a603cfb41bd7961382eddb897055a0
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10704 bytes
SHA-256: 9c4cd5eee74c22dcba360b74699afd1904be319281efe900159e19e03922c326

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