Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1611b162637c3eb…

MALICIOUS

PDF

100.6 KB Created: 2021-04-06 03:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e598b1a6a7339f4630879ccfb03b6fc5 SHA-1: 959502df274355fcae1660cca921af2ebe6af0bf SHA-256: b1611b162637c3eb712d208d5181002643be0eb859b51cc1593c1e55b722c038
156 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 0.9986

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://vilenefex.ru/123?utm_term=examen+ceneval+preparatoria+pdf PDF link annotation
    • http://pokuwasu.iblogger.org/dozutupilexobizukupom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6011deb4e030b.pdfIn PDF document text
    • http://kutojiresifofu.iblogger.org/fozalekinimajabedusik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_605b60817a2d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450248/normal_6003989838ab2.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/xufakirotiluf-pewevegugiwaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_600a0bd1ec665.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/lixiranew_xipitukefap_fozuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_6027650bf3c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_605626faefddb.pdfIn PDF document text
    • https://nixovutak.weebly.com/uploads/1/3/1/4/131406963/lituzoketu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_603944a98fce9.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/1501467.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/bupesejirijejus/prime_factorization_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/mozinawo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/22137324012.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/a_pair_of_silk_stockings_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/dunileteropezuvo.pdfIn PDF document text
    • http://rileponabamel.rf.gd/canon_4000d_specs.pdfIn PDF document text
    • http://dixikigozasam.epizy.com/how_to_test_pressure_sensor_switch.pdfIn PDF document text
    • http://wumuduwowuwi.rf.gd/pneumatic_cylinder_working.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/best_kalymnos_climbing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/wironimozep.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_off000147ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CA 5208 bytes
SHA-256: 31e924dfe288519a315318ce3e89172cb5496bb8d409a93293faed4170f4304b
font_01_sfnt_off0001597b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597B 12732 bytes
SHA-256: 7f6f0f20d131a68a5c0692a0dc8895eec3169075eb632d21768e54b0cd68461b

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