Malicious PDF — malware analysis report

Static analysis result for SHA-256 da916840adb154a2…

MALICIOUS

PDF

65.5 KB Created: 2021-02-21 18:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4522e85ed8d10eaffb93795349c9155e SHA-1: 8c71e347255950e7aa60db415e6070d3678330f4 SHA-256: da916840adb154a27a628de17a4b5ef270338da4c7643e041d7fa78c61996e10
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=mr+heater+big+maxx+parts+edmonton PDF link annotation
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/dusuw.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/kudazijefisi.pdfIn PDF document text
    • http://lifegirls.site/wonder_bethel_musicbv66g.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/muzivokanedexit.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/hvt9mgj/lopasosinegofe.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/fhjibR0/dovode.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/a7iblib/reckless_rc_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/dLbhjhh/how_to_play_chess_in_urdu.pdfIn PDF document text
    • http://thailandlove.site/stir_the_new_free_tvkqpc7.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/hcjcOfg/what_colors_you_mix_to_make_burnt_orange.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/4114419.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/rujimidujek/game_online_terbaik_untuk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/86307563438.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/report_card_comments_for_high_school_art.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_off0000c0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 5556 bytes
SHA-256: 2fec991d7e355f8c34196bd70a9897c540b191ff2401cf626a5ec080c638a2f3
font_01_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 11096 bytes
SHA-256: 14416c972f1f88782a7d34530225b18a882c252630cf29fa830d0e8c8782544f