Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a301463a5b8f13…

MALICIOUS

PDF

81.0 KB Created: 2021-03-30 23:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: df7daf15a1ab36d82b1dd86e29545c57 SHA-1: 5c7030608fe1aef128a33b4ab1d8cc09d4d60b44 SHA-256: 16a301463a5b8f131e4c75463478f5cc0dfcfa6d558d837c2fb258e248710b2a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it's part of a link farm and contains external URIs. The primary malicious URL, 'https://soxebez.ru/award?keyword=beloperone+guttata+pdf', is likely used to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords that suggest a lure for SEO-based traffic. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://soxebez.ru/award?keyword=beloperone+guttata+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482402/normal_6013680a85413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_605dd41c3c2c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_60462950e8830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_60415ad01f4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_60353e7bc9dfa.pdfIn PDF document text
    • https://keridamanitev.weebly.com/uploads/1/3/5/3/135326745/8ef1e7d.pdfIn PDF document text
    • https://weritesi.weebly.com/uploads/1/3/5/3/135314652/1782880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_6062b57201efa.pdfIn PDF document text
    • http://dafizejujen.22web.org/riesgo_electrico_en_el_trabajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fd7c855a594a.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/2751902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fdb2271d0011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sizabo/59782643805.pdfIn PDF document text
    • http://tasopawak.rf.gd/is_toshiba_fire_tv_edition_a_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/when_should_you_send_wedding_invitations_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/bitcoin_arbitrage_opportunities_a_short_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/bk_precision_880_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/the_crucible_act_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/vadinu.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/badminton_rules_singles.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/character_appearance_sheet.pdfIn PDF document text
    • http://punaxixodakuguk.epizy.com/58488577257.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/ratupenajuvumeda.pdfIn PDF document text
    • http://kozitoxezafovi.rf.gd/97896985876.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 5080 bytes
SHA-256: c76baa66818670b4e45d83b795505268e8a3827493e18fc7b7475421aa6c517b
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 11356 bytes
SHA-256: c05e714b98209f0ce245e29053ced02b7d5efdab2f1c7e952107aeff35f98dd4

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