Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82d18ac13a4bd10…

MALICIOUS

PDF

86.2 KB Created: 2021-02-15 15:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: df922f1cb0947016acd6632d3f26bb1f SHA-1: 912ba03bee399b54297bc22007d6a6a9fd55ad68 SHA-256: a82d18ac13a4bd1027ed3de57399dbf25f0482b7cc989f09571f8671e400cc2d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely involving embedded JavaScript to facilitate redirection.

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://bologen.ru/strik?utm_term=childe+harold%2527s+pilgrimage+canto+3+analisi PDF link annotation
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/purebamedutidezem.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/vvjdgfy/wezuxipu.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/9655968.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/tufipomu77z7d.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/cifU1YF/53998666779.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/Xgchcjc/xibikafukemelunojem.pdfIn PDF document text
    • http://frankkyko.com/czardas_tuba_sheet_musicqn6lj.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/eggeajg/automatic_tapping_auto_clicker_record_replay_tap_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_5fc80a98a6e10.pdfIn PDF document text
    • http://chatik85939775.fun/bipolar_disorder_bookw3ntt.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/egjijhj/83133881604.pdfIn PDF document text
    • https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/relibezup.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Siah7jg/hill_climb_racing_3_online.pdfIn PDF document text
    • https://marodesama.weebly.com/uploads/1/3/5/3/135349202/melotuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_5fd35744ed405.pdfIn PDF document text
    • http://unosital.space/multivariable_calculus_8th_editioncaz22.pdfIn PDF document text
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/nufawisejan_nojifot_tozar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5ff970be0bc4d.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_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 5496 bytes
SHA-256: 9b7c4e14cdf04b4d8ac008a0bbb94dbf9e78c16a275e9f88cbdd3e41e18aef79
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 11444 bytes
SHA-256: 8e1d59ad6df90f000b1be8e30066c81b98888c8faabab70ce2fd983a18c15e08
font_02_sfnt_off00013d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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