Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc48d8de759c666…

MALICIOUS

PDF

87.3 KB Created: 2021-02-28 11:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a6b408e00f12eb970f8a54880d94de91 SHA-1: 19b1898bf39f766e384f626429bba6663818c84c SHA-256: bcc48d8de759c666cc3f0eeb2fd13411daf38faa699dc0b9bfb225c1573a15e7
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • 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://jottigo.ru/strik?utm_term=spanish+vocabulary+lists+printable PDF link annotation
    • http://bupro.asia/boxosimejifg9xk.pdfIn PDF document text
    • https://winokagadav.weebly.com/uploads/1/3/2/7/132740598/179441.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/85aae2a8c.pdfIn PDF document text
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/57241e355b963ce.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/govarawamovewepe.pdfIn PDF document text
    • http://senteber.site/tojurugajewowacwt4l.pdfIn PDF document text
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/2827156.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/qNjfFjd/university_of_montana_teacher_job_fair.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/51f3c168dfefe.pdfIn PDF document text
    • http://duxolaw.22web.org/android_7_easter_egg_no_cat.pdfIn PDF document text
    • https://pukuxenusafo.weebly.com/uploads/1/3/4/7/134711282/xepopinonezunifume.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/qHjak3V/tower_defense_zone_mod_apk_unlimited_money.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/4962022.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/para_que_sirve_la_vitamina_b12_500_mcg68eiq.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/kjihdjb/game_of_thrones_escape_room_dubrovnik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwukimip.epizy.com/gupazisolotakirumevamef.pdfIn PDF document text
    • http://zapumodexajo.rf.gd/buderus_logamax_u042_manual.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_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 5428 bytes
SHA-256: 6bdb39cf66e4c680da82b9282f5aab7233ba790306ba046076fb63f324e60d22
font_01_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 12008 bytes
SHA-256: ed2653ce2b1d5d89e1f0fe594b4d7dce2e58d2e28f75bf3cb42db3bb8d80be16
font_02_sfnt_off00013a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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