Malicious PDF — malware analysis report

Static analysis result for SHA-256 276da5848dd51667…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 18:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1bac1a51ce2ef2323c3d7b12deee6923 SHA-1: 6f9216548e3f7d633a4440e509ebc8c61ba8799d SHA-256: 276da5848dd5166751badb96286a6ad701e187b574d74c402f59776975d3e573
186 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links to external websites, identified as a link farm. The document body, though partially corrupted, suggests a lure related to 'hysteria pdf'. The presence of many distinct URLs hosted on disposable domains indicates a likely attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://seumenha.ru/award?keyword=the+aetiology+of+hysteria+pdf PDF link annotation
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/1d546b.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/patubawomixap.pdfIn PDF document text
    • https://dezubawutojowi.weebly.com/uploads/1/3/1/3/131398539/8315381.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/7688177.pdfIn PDF document text
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/gufap.pdfIn PDF document text
    • https://zogewuvenofo.weebly.com/uploads/1/3/2/6/132683334/9762940.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/1341250.pdfIn PDF document text
    • https://ketokaxuvora.weebly.com/uploads/1/3/1/8/131856042/5650132.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/gofivetitokonaxax.pdfIn PDF document text
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/968b5.pdfIn PDF document text
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/6c731.pdfIn PDF document text
    • http://whitetwo.space/switchblade_knife_for_sale_ukjkn2a.pdfIn PDF document text
    • https://gisunotagalaros.weebly.com/uploads/1/3/2/3/132303086/1826161.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/692581.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/gowikawirevozegebire.pdfIn PDF document text
    • http://lightly.store/pexubik0qni2.pdfIn PDF document text
    • https://vefoduwuwi.weebly.com/uploads/1/3/4/9/134902927/76da365042a86.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/bufoxixilixutoniraju.pdfIn PDF document text
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/tonalab.pdfIn PDF document text
    • https://zinenefubodejig.weebly.com/uploads/1/3/4/3/134338026/sekiva.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/683813.pdfIn PDF document text
    • http://clubstore.pro/wunimanibosukaximoputidwj8we.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_7233ccb138df45909614facac8c7882a.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_991844bb646945cfb8014e42bf9e17e0.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_bab4131814354ea5ab57cda6c5e2826d.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_d66ee9149a5f4b118f8dbfccb4dc86a3.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_3c4afaaf6c4847bf9b58667c28912aa7.pdf?index=trueIn 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_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 5356 bytes
SHA-256: 32162ed23bbcccb537f899c851c7691ce4755ea714bbe7d968226e023d7dc56e
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10644 bytes
SHA-256: 7f8267da558badf013d71fc863e3c74ce33311f0f5e093e94245a734cc2d8ae8

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