Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9509dc05aabff5…

MALICIOUS

PDF

74.6 KB Created: 2021-04-01 20:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6ce56071d8ee71e65117c18441a8896 SHA-1: 11c7f7fb67785822f7ef3a6fab8990a76bf380b6 SHA-256: af9509dc05aabff5f0ca1ca66a563f75931c1452b624d2b6ff973954acab597e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/strik?utm_term=fundamentals+of+engineering+%2528fe%2529+electrical+and+computer+cbt+exam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385216/normal_6011ea64a19e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_605e161de002d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_6048e61946c12.pdfIn PDF document text
    • http://wumagakex.iblogger.org/que_son_los_antibioticos_y_para_que_sirven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_6061f3f4f2a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_603fac4e4b297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesiperuvi.rf.gd/bixuxogedemazoginam.pdfIn PDF document text
    • http://safasufozoz.rf.gd/i_love_you_movie_link.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/format_rujukan_apa.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/patent_invalidity_search_report.pdfIn PDF document text
    • http://vigukesege.epizy.com/what_is_reflective_writing.pdfIn PDF document text
    • http://joxumokuri.epizy.com/zarazafex.pdfIn PDF document text
    • http://litofafowiralo.epizy.com/vans_old_skool_plataforma_precio.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/xutopo.pdfIn PDF document text
    • http://sebubexegan.rf.gd/hear_me_imagine_dragons_piano_sheet_music.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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 5792 bytes
SHA-256: ee20563cb64079671a4d422a8d04ed5357be702081caa23bb247fc4a410412fa
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 10272 bytes
SHA-256: 4853ebc825a0f1550f5b3940ec54565e52deb4838d3f4a159b3a0da22ae6ec54

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