Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d63509b28ceb6…

MALICIOUS

PDF

80.8 KB Created: 2021-04-16 08:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d498e537ea125c4dc4d64be2c4f1c90 SHA-1: c526e45d0e4717713ef16b0fc72fb18765f8d92d SHA-256: 055d63509b28ceb6ea599a6fb7ea7d1236ea966dd37cd5b138246ff7a12c4627
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=03+infiniti+g35+transmission+fluid+type PDF link annotation
    • http://chelobaka.space/624558348977tmii.pdfIn PDF document text
    • http://gelchlen.fun/toefl_listening_sample_testx3uug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_6014332f4910d.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/ruie6hf/spin_the_wheel_yes_no_maybe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6058e330f03c0.pdfIn PDF document text
    • http://ru-1.casa/976985377460n7nb.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/ajb7wge/best_antivirus_for_pc_windows_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601f64c5c942f.pdfIn PDF document text
    • http://lumacy.site/stock_markets_around_the_worldoem90.pdfIn PDF document text
    • http://bigpleasure.ru/tunowazefoxotuigtex.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/ihffhbI/top_100_best_games_on_steam.pdfIn PDF document text
    • http://cloudmarket.website/casio_hr_150tmnu059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_605d0e0f149b9.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
    • https://s3.amazonaws.com/jumedemimo/vinowetaxajebuzunoragam.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_7eab4f0199c446d1b7445155e709a277.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/24312746005.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_cd66358bf02b48d0868066970626c40c.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_1dc85840f38e4ffeb1bcf47df6b0cbc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovibu/16915529171.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5680 bytes
SHA-256: 6a7eb4a04b5547d61930a6eaa2edd8ee360557f7289fdd4d25e77e0138c11cf6
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10508 bytes
SHA-256: 983ae9de5f7aa7772cdf678162b02a46f2a0ede73364e5e5b709098ff5c286a1
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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