Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa641da44c3bfedc…

MALICIOUS

PDF

73.8 KB Created: 2021-02-14 04:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c51a30ae437e81951aacf655ba1c8cc2 SHA-1: 421b686bd879369c83ba2d159ce6efb26d4b7bca SHA-256: aa641da44c3bfedc4270107b77a5a4622bc2f52f5eec48af815cd24d468ea893
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript, though not fully analyzed here, further supports the potential for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=super+mario+odyssey+wallpaper PDF link annotation
    • http://drovazvenigorod.ru/chrome_os_iso_32_bitgbqns.pdfIn PDF document text
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/7140065.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/2371344.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/jofepipo.pdfIn PDF document text
    • http://7lessons.space/81619054127p55pe.pdfIn PDF document text
    • http://reabook.online/35858876908n3p2z.pdfIn PDF document text
    • http://biomaniix.website/majawowu5867r.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/befolimiseterog.pdfIn PDF document text
    • http://homeolimp.com/business_plan_bakery3mmgr.pdfIn PDF document text
    • http://probkin34.xyz/ultimate_galactic_conquest_modkglwy.pdfIn PDF document text
    • http://good-production17.site/65157096997a47zc.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/4014318.pdfIn PDF document text
    • https://napepoxamugif.weebly.com/uploads/1/3/3/9/133997580/telipimokasiv-guvugenox-fudasaro.pdfIn PDF document text
    • http://kleomaften.online/p3d_f_16_manualh2q91.pdfIn PDF document text
    • http://vereffka.xyz/traktor_pro_2_download_full_versionahg7s.pdfIn PDF document text
    • http://skywonder.space/82848221091zyx2y.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/0789ae6.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/nedijowewoded/91233330937.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/vatizumapuje.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/45479820610.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/clinell_sanitising_wipes_safety_data_sheet.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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 5400 bytes
SHA-256: ed0eaa79ad64cdb109dcd09d64404038215a0b08090a144e5547ff80cad3186c
font_01_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 10848 bytes
SHA-256: 5d6a192ed4572442bb5108cc7ff0de040abdb17d7611cc3a404bfd1769c01644
font_02_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06