Malicious PDF — malware analysis report

Static analysis result for SHA-256 822eaad815558854…

MALICIOUS

PDF

71.4 KB Created: 2021-01-21 11:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9e8399a3f37fdeeb281f0ddd454480e0 SHA-1: e514398ff99c99ff665572117f239f483d6ca175 SHA-256: 822eaad8155588540f4263c0d9dc8a3383ac65ddf22697d0bd96409c0bb3d025
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://trafffi.ru/aws?utm_term=do+re+mi+music+sheet+pdf', is presented as a music sheet PDF, which is a common lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure and heuristics point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=do+re+mi+music+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503692/normal_5fe6513b6ccb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ffa004abace9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5ffb4608260d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fea070b5cfe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5fac0d2b79e23.pdfIn PDF document text
    • http://sonuzevemuguke.iblogger.org/chinese_font_for_adobe_illustrator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fe5b7f1aeaf1.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/falodavoxubizene.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/legapatatezisa/balsamiq_mockups_desktop.pdfIn PDF document text
    • http://dexifuv.epizy.com/magnetrol_guided_wave_radar_level_transmitter_706.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/boxavuwixobuwez.pdfIn PDF document text
    • http://fojamemu.epizy.com/99063597015.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/inflexible_yogis_flexibility_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/array_types_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/you_are_welcome_in_french_informal.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/98492421985.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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 5152 bytes
SHA-256: ce726465358c1b2c52d3e3bd4f3205e3be9e1862cf5f36f72a97764421ba3a2e
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 10412 bytes
SHA-256: 811f0e522305a10a28d10db176e96be270226b5b12d958bb2e1272839c1b9cbd

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