Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc911ed6f0a0362…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 03:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24ebfd4d34c92dc4e7f15b867867cc4c SHA-1: bd050edfe63f6688bbd25d1295fe1915434236f2 SHA-256: 2bc911ed6f0a03628f6b0ad2804b8f46718b41f4519334ad5d5f00cbe74edc6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to '2017 ap biology free response answers question 1', likely intended to trick users into clicking malicious links.

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 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://fokemale.ru/wix?keyword=2017+ap+biology+free+response+answers+question+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6024bb9a02b4d.pdfIn PDF document text
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/kamifibo-xufenuma-paxamok-wanajut.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/3518588.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/nazag-siwekolojomo-disaxa-jarubutesetab.pdfIn PDF document text
    • https://burodepizojeke.weebly.com/uploads/1/3/2/6/132696233/jukabarofefa-nuxoredagojokev-futile.pdfIn PDF document text
    • http://korsabarca.com/jofawumetawopno95t.pdfIn PDF document text
    • http://repair-planshetov.ru/gauss_meter_flukenx0xo.pdfIn PDF document text
    • http://pmaider.com/japasotokaxorakedieq7.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/50e56.pdfIn PDF document text
    • http://storeyou.store/how_to_crossfit_at_homex01co.pdfIn PDF document text
    • https://kerijifulonuf.weebly.com/uploads/1/3/5/3/135328136/5e9e3b7ed.pdfIn PDF document text
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/d8c225b4bec2.pdfIn PDF document text
    • http://rasprodavaika.ru/velocity_vs_time_graph_negative_acceleration1blmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fd0d5801f6dd.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/jotinodivufogaf-xiwezutuw-xetorexilerekeb.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/zejoran.pdfIn PDF document text
    • http://pe50off.pro/best_robot_vacuum_and_mop_ukugex0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/89298825166.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/bufopetidabusuw.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_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 5840 bytes
SHA-256: b65cafea73a18aad2da3f069759fbad87c6af9a3c865f6c2fce0425503de68ca
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10504 bytes
SHA-256: e4fa3b29e405c84539da0b872bdd8d6f90cc3c535f39d224ee360ae6cc9a7101

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