Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f63656ba65e6f4…

MALICIOUS

PDF

74.8 KB Created: 2021-03-03 20:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: af90803dacfef553e7c5a8af4b1526ae SHA-1: 20bcf4aca3e1e66730e00d2cce5d49cbcfc8b3de SHA-256: 62f63656ba65e6f4cc32dab3a124fc240fb5e7c56b4f0cb349a1f08033bacda8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm used to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful sites.

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://leonvi.ru/strik?utm_term=improvised+munitions+handbook+legal PDF link annotation
    • http://fuvirakopu.iblogger.org/what_do_you_mean_by_the_theory_of_plate_tectonics_class_9.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/vomuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6011040e0d764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5fd3d1f42c31b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_600820a8abaef.pdfIn PDF document text
    • http://titanof-filtr.ru/6413609054shpz3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601a411a02315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe726d14a119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5ff53c5a264ed.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/069d5944a085d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60112840333d4.pdfIn PDF document text
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/7737665.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/d9c69cd382e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipewax.rf.gd/sri_lakshmi_narasimha_sahasranama_stotram_lyrics_in_tamil.pdfIn PDF document text
    • http://xotesevuves.epizy.com/86951214621.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/adform_api_guide.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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 5576 bytes
SHA-256: 11648f47cdcf601e3cc5fba7bf3a32f6e640abdeb3d352a11a7064eb942e957f
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 10988 bytes
SHA-256: 63a5a83cff15d4380244557025fbf215a2a0f889edc229b05ab122f6d6cdded3

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