Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a161d2cc8398fa3…

MALICIOUS

PDF

79.8 KB Created: 2021-06-12 05:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ab1e52da2ca94fb64ed8e24155f36066 SHA-1: aa367c8d3ec263dbf3483a8eaeef2f1a695412fb SHA-256: 1a161d2cc8398fa3f521bdc3926198bb6f6e636080ad9db1ba653bd06fbcd583
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One embedded URL, 'https://chcial.ru/pbw?utm_term=sam+harris+on+free+will+summary', is particularly notable. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/pbw?utm_term=sam+harris+on+free+will+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6058447062938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5fe30958f1b7f.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/sikevujeserikim_nuzadaraguxopu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393486/normal_5ff40b558bddb.pdfIn PDF document text
    • https://zufinoresazoso.weebly.com/uploads/1/3/4/7/134711963/bujasik.pdfIn PDF document text
    • https://pufakifitapota.weebly.com/uploads/1/3/4/5/134581323/zidoxonevujijutizeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_60bf27b1228df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_602772b2e1eb1.pdfIn PDF document text
    • https://suguvojonejufo.weebly.com/uploads/1/3/4/5/134585364/nuzijotuwaba.pdfIn PDF document text
    • https://sizosunobefema.weebly.com/uploads/1/3/1/4/131453016/5581599.pdfIn PDF document text
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/zaladodo.pdfIn PDF document text
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/nurixegaxu_gikabuzevuxin_rasot_rofaseperuzof.pdfIn PDF document text
    • https://suxuwimuwudex.weebly.com/uploads/1/3/4/6/134641155/2952305.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://gibuwodebu.pbworks.com/f/two_examples_of_situational_irony_in_the_crucible_act_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae30552a-32ae-42d6-9a13-eedd2981a8e4/mefogikogepisididiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25720056-6e82-4c28-952e-0706931923e9/bodupixebipogejesubobojap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bdc88c-5baa-4a42-8973-27aba88ee074/5577236572.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/pazosixipevofugezarib.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144629037/60267268385.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/sosipa.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/faragepixepetegexokew.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144678351/takatere.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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 5104 bytes
SHA-256: 7e5bb0dd5200b93303b415af6ac143490c107f1a0afdc5231f52b566016ebaf4
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 11316 bytes
SHA-256: 206e5e62e03406198e0e95f9bf8cb0e0cf01928a3d400829df8085b6283be27e
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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