Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f1dfc17f1af612…

MALICIOUS

PDF

81.3 KB Created: 2021-03-16 02:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e77047df3a2744b7e932f188afdc4a57 SHA-1: d67454320d4b5a3d18598ae1a9e3da9fe568559b SHA-256: 61f1dfc17f1af61287f0700d51e0b97851e0095edf10861e15b5268e18016cd0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external links, including those with numeric slugs and potentially generated SEO content, points towards an attempt to drive traffic to malicious sites, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=guts+raina+telgemeier+pdf+free+download
    • https://cdn.sqhk.co/dudugetogi/6m2aKtn/the_american_dream_vr.pdf
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/jilegufotak.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/1822822.pdf
    • https://cdn.sqhk.co/pesegozod/dxccgfQ/first_strike_bracket_closed_qualifier.pdf
    • https://cdn.sqhk.co/texafikogot/WjhrNjh/zorunu.pdf
    • https://cdn.sqhk.co/xalibolopov/a1jagj4/volegikezamo.pdf
    • https://cdn.sqhk.co/siviraboriru/ja3Hsif/ninja_jump_game_ios.pdf
    • https://cdn.sqhk.co/sabumijobude/jih504I/smart_switch_transfer_data_copy_all_databases.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/fizibanote.pdf
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/3bc43c4f.pdf
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/kikopusesaresabotare.pdf
    • https://cdn.sqhk.co/guvevifowo/5wahfna/47129689373.pdf
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/2999323.pdf
    • https://cdn.sqhk.co/levowexesu/mijsXgg/download_b612_beauty_filter_camera_apk.pdf
    • https://cdn.sqhk.co/zugivakizo/acWhjia/gears_of_war_2_pc_download.pdf
    • https://jowovodepavilim.weebly.com/uploads/1/3/4/6/134651336/tawunojekof.pdf
    • https://mopuxemunokele.weebly.com/uploads/1/3/5/3/135318458/b53919957ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukedil/woxopegakadabebevemifu.pdf
    • https://s3.amazonaws.com/gotijejaj/withdraw_offer_of_employment_template_letter.pdf
    • https://s3.amazonaws.com/pasawe/45601655352.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc43.bin
78af2b09ec1d2aa8a2e919b1ae05c1a699e35f31e4de58c1c6d7be3a6fdeb0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 5484 bytes
font_01_sfnt_off00010ee8.bin
43e30ede00e583c8969418e9c1fdf44833cd62c65e66f5f1dacdfc050c0868d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 11396 bytes

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