Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6f52d330fb0bfe…

MALICIOUS

PDF

77.5 KB Created: 2021-01-25 10:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 825deaf32e28a3962da8cb25855851cd SHA-1: 7b257b1ae62f88c6b6e0777e9d0e8d4e5ce0d54d SHA-256: 2a6f52d330fb0bfe2437d3b6f38a2736c3670561e2e010e68b32b9cd2ec0a0c8
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious sites.

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://baarspo.ru/123?utm_term=great+falls+music+festival PDF link annotation
    • http://probnik1313.tech/dulijowitezoluus7ln.pdfIn PDF document text
    • http://praktika-ingenieur.com/vuxuwezovgztos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_6005210b342c4.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/gomokosopopozogigodugamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fc66ca29f6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fd2c318aa479.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/porurifiraxev_kezedidori_fevitit_suniwepe.pdfIn PDF document text
    • http://santaparker.store/jorutiwafunvuvtx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415291/normal_60045a6e8738f.pdfIn PDF document text
    • http://jibitivi.66ghz.com/gram_staining_experiment_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_5fd772531cc9c.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://kosatalek.rf.gd/aadhar_card_by_mobile_number_only.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/free_lagu_senorita_shawn_mendes.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/89000809059.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/8154295722.pdfIn PDF document text
    • http://matunojusorim.epizy.com/b-_form-_group_horizontal_label.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/birodakalilomosavetaloto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 4784 bytes
SHA-256: 0dbdc919b4587ab3158739133506c83161b789bfdc70728f2d29126de4062bf4
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10740 bytes
SHA-256: ba2fcd77ee126ad77608fc43de51a6d354325efde509497889d5187cac66343d
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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