Malicious PDF — malware analysis report

Static analysis result for SHA-256 8181c030d35941e3…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 05:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8829b8dad665ecc9944d0da807d2e143 SHA-1: e6c18ebad57d378ca079acaa006abb608b7b4cf1 SHA-256: 8181c030d35941e3066f1623f0ae20a2dfd2d0818198043a184dc1a5f3e61675
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://lozipotod.ru/strik?utm_term=elements+of+music+definition+and+examples PDF link annotation
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/5234364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_6021a2604b55d.pdfIn PDF document text
    • http://cashfree.store/14093578608sjdag.pdfIn PDF document text
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/13d6c1d08.pdfIn PDF document text
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/6775994.pdfIn PDF document text
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/220bb2a630cb7a9.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/8845642.pdfIn PDF document text
    • http://aov.one/cake_designs_for_marriage_anniversarycpf5x.pdfIn PDF document text
    • https://dosoxikovere.weebly.com/uploads/1/3/0/9/130969917/5149649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d2484a41e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_600820a8abaef.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/ef35712f776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd288c65e8fa.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/is_sql_worth_learning_20194n0ll.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/gipudikun.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/lulobuso_xotigitarifefov.pdfIn PDF document text
    • http://freshnatur.fun/cisco_firepower_8000_series_appliances_datasheetnifpr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_604aabaa3e940.pdfIn PDF document text
    • https://jezemubo.weebly.com/uploads/1/3/6/0/136094449/kapup_vefidir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5112 bytes
SHA-256: 2ec3a37992d6d6c2f25323836825b89edbf26ca47d3abc58bc30ec39b6eb4d20
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10360 bytes
SHA-256: 0503c3f6050bbd294e9257b3bfeea6d14a5286f70aff435f7dd68b133206445d
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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