Malicious PDF — malware analysis report

Static analysis result for SHA-256 c841838a3dd9a715…

MALICIOUS

PDF

84.9 KB Created: 2021-02-16 20:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9432e731b4e52adb2382f1f9f8dffb7a SHA-1: c4ea9507ce11084cf40df2e7d1de1e4e4b133cf8 SHA-256: c841838a3dd9a715a02dffc4387554b3433af6d6e8cb914017f9cb2c5033f127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many with numeric slugs, indicates a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a PDF document to host numerous external links, likely intended to redirect users to malicious sites or download further payloads.

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 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://bologen.ru/strik?utm_term=el+sur+ficciones+borges+resumen PDF link annotation
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/05f101b980a83d.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/jihL9FU/colorful_neon_foggy_night_city_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/f8zgQoo/police_pursuit_today_live.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/c9giRRQ/folafuladerefulaxisu.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/HueajgU/extra_equip_slots.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/ajbmnjf/zombie_combat_action_badge.pdfIn PDF document text
    • https://cdn.sqhk.co/savadapo/xmNwghw/turbo_driving_racing_3d.pdfIn PDF document text
    • http://citimart.online/rosisigukiwimakinh93g2.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/83179591368fin2i.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/gggf4jj/junior_graphic_design_jobs_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/hcZidaZ/slither._io_codes_2020_april.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/eGfjiVT/72249603759.pdfIn PDF document text
    • http://itravelimpressions.com/vespa_lx_150_manuale_officinabwkgy.pdfIn PDF document text
    • https://cdn.sqhk.co/xogeloke/ib8jhid/wifisopowaxolitujowomuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/qPkgjhi/call_of_victory_hack_apk.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/nuvukivaxiren/15432203953.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/10626389136.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 5088 bytes
SHA-256: ff2094c3f21bfdf471d2663c96fe164aa4945ec02391567175fc8cde04237ca0
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 11576 bytes
SHA-256: eef506d632fd63caa541270da0ee567cd01f3be2728935504daf425c21595aec
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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