Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21cc3f85eb05a7d…

MALICIOUS

PDF

81.9 KB Created: 2021-03-13 22:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d8600c713ff076e102779eef47347168 SHA-1: 24f6ce7e9410587da14972cfbb174990d9f4cfd3 SHA-256: b21cc3f85eb05a7d2e077ca32b3756ca491cb28203398e5a525dc38cf96de141
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to a specific PDF title, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/123?utm_term=medical+biochemistry+by+chatterjee+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481671/normal_602a0d3095cbc.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/fotekoduxugosusoxen.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/6662392.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/52588376278.pdfIn PDF document text
    • https://zegiwamo.weebly.com/uploads/1/3/4/0/134018031/9881833.pdfIn PDF document text
    • https://sixobeludid.weebly.com/uploads/1/3/5/2/135298518/1992627.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/numozuteda_surom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_5fdbcbee67dd1.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/oriflame_catalog_january_2020.pdfIn PDF document text
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/foladof_vefuxijiwusudat_zuriga.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/2273407.pdfIn PDF document text
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/dupopogurugux.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/how_does_the_after_book_series_end.pdfIn PDF document text
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/kisimojad.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/8619287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukasorepej.rf.gd/steam_boiler_types.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_8e0c83da3d2045fe951a1420db692fa2.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_9ebab53df68b4978a9f13a2ec3044c25.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_86b9cfb8f79b4041a236dc08813036e8.pdf?index=trueIn PDF document text
    • http://riberudedanute.epizy.com/watugavekodefuret.pdfIn PDF document text
    • http://tumofif.rf.gd/xewab.pdfIn PDF document text
    • http://nununad.myartsonline.com/merriam-websters_compact_visual_dictionary.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_57c8379b1af34fe38529b11cdc97727e.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/how_to_do_the_google_thanos_trick.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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 5716 bytes
SHA-256: 816424766ef74a941f9a0236706f1a5d4fa73c6f5cb52fe41ff06f84e63a5544
font_02_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 11356 bytes
SHA-256: 447cf3fd9ab0cf7428c081feb03111b6bc8c972d81a71596d787e74240d3fe30

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