Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eaaae29c48a130…

MALICIOUS

PDF

75.2 KB Created: 2021-02-24 13:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07792def1fc5d33d020fcda2c68458b4 SHA-1: 6913e5fe300b83d9eda287c9dde5c90b4ab6ed4d SHA-256: 71eaaae29c48a1304151ae8228b53385ecb5757a9d1914dc2182fe5f1bd90825
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to 'Byzantine empire worksheet answers', indicating a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/wix?keyword=byzantine+empire+worksheet+answers PDF link annotation
    • http://vonokumi.iblogger.org/format_mac_using_bootable_usb.pdfIn PDF document text
    • http://blacklaser.ru/jobuwepiwy1vz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5ffcd87a8ddce.pdfIn PDF document text
    • http://voseboler.iblogger.org/jubifipufekigalumovibafam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_600a46a527d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd173610c9ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumatefofexulen.epizy.com/information_security_awareness_topics_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/faloxe.pdfIn PDF document text
    • http://nupopejif.epizy.com/vepafa.pdfIn PDF document text
    • http://tetigod.rf.gd/bivupoguxotuxaguva.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/30295955481.pdfIn PDF document text
    • http://fezexebu.rf.gd/3121426475.pdfIn PDF document text
    • http://puwepubofixa.epizy.com/bitugamafinitugowirufiva.pdfIn PDF document text
    • http://zaleponijodo.epizy.com/38869592727.pdfIn PDF document text
    • http://xipudabokodem.epizy.com/2007_chevy_impala_transmission_problems.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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 5384 bytes
SHA-256: 95fe0d240f1f4380740572ec38fd7b061cf40fa6bfee98a364d849b045d49186
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10468 bytes
SHA-256: 18d4914178b069bd6f4f845d61022ef8aa7c73b2ba6a3ca32bb5d615d7e6c02a

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