Malicious PDF — malware analysis report

Static analysis result for SHA-256 69798f8f5268eb53…

MALICIOUS

PDF

88.9 KB Created: 2021-02-13 09:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a237811b847c3a840eab6401bfab5f49 SHA-1: f1f488dc07b94157aa9e92cf3c287c67b5d0a4a5 SHA-256: 69798f8f5268eb53f2f89f854fade978d64fef2420c02abdf3f8a4ff44fc6051
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable domains and appear to be part of an SEO link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=dark+souls+3+summon+calculator PDF link annotation
    • http://infokurs.design/77531789357tw01i.pdfIn PDF document text
    • https://cdn.sqhk.co/sudofeno/sjiijKb/racing_fever_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/jceOji8/battletanx_global_assault_ps1_rom.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/wibisanus_kaxolafinek.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/5iiUjef/47761619520.pdfIn PDF document text
    • http://workshop-fb.ru/79903858416x97ka.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/ggOibNG/mokeselejifu.pdfIn PDF document text
    • http://thailandlove.site/flip_flops_bar_atlantanno4z.pdfIn PDF document text
    • http://meetsucre.pro/pupurunevipomuxudunoj5pigw.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/JYhjhe1/matapekadubap.pdfIn PDF document text
    • http://serviceforyou.site/541863496805tj4n.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/tq2jcja/driftwood_beach_club.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/9DA7jjp/injustice_gods_among_us_year_2_comic_download.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/gulapore/vidak.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/drugs_acting_on_gastrointestinal_tract.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_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 5172 bytes
SHA-256: 57e675a980e28a9dbf084d5b90aa606dc6b72aa14fefcc8c680d0512fc3ad96a
font_01_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 10952 bytes
SHA-256: 1747b9ed037bd53154c5a0fb0999719130fea36e7e9485299944a26b1f392577

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