Malicious PDF — malware analysis report

Static analysis result for SHA-256 41762ca1532087df…

MALICIOUS

PDF

78.3 KB Created: 2021-02-21 13:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 07b45223739ef0058da0d577070226bf SHA-1: 27cfc07b340756fca3a9d72ad6c9ee64a7bc48eb SHA-256: 41762ca1532087df5707cd4d2a91612b7b5de6b71f64b9404107eefedf3e6a8a
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains or redirectors, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of a download button lure further supports a phishing or malware distribution scenario. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=twilight+2008+dual+audio+eng+hindi+1080p+download In PDF document text
    • https://cdn.sqhk.co/tuledapozato/hdGP0hh/rumble_in_the_jungle_book_by_ranjit_lal.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/1253000.pdfIn PDF document text
    • http://sogigubesidon.22web.org/wowuvezorunib.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/duzorilejipoz.pdfIn PDF document text
    • https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/xujipizugamigusagas.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/jbI2Bgf/tujaxomipijaluteb.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/606408.pdfIn PDF document text
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/e07d67.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/2734614.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/YrA3fbJ/assassin_archer_modern_day_robin_hood_mod_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/fejenijovekozu/bangladesh_army_job_circular.pdfIn PDF document text
    • http://bixagolowetuf.rf.gd/ing_maestro_card_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/flight_sim_2018_hack_android_1.pdfIn PDF document text
    • http://zudozam.epizy.com/jilojalexufarufumufi.pdfIn PDF document text
    • http://vukotirigepiv.epizy.com/netuzosukitabosimaz.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/cinderella_weight_loss_solution.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 5508 bytes
SHA-256: 60be165d545a781838cd07810da4de6b642ff246485a27d3512e568eba179631
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 11424 bytes
SHA-256: c12a3947a9190d35a517d970aa347f2f8ce13cb44dc1ca1a31960d9a006229e1

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