Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eb24efba883fa5…

MALICIOUS

PDF

84.9 KB Created: 2021-04-25 20:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b4eaf06794104a6c037bcc38aec95a43 SHA-1: 18ac9a0387f9a298914e66a74f4b4bd6b6bcf010 SHA-256: a4eb24efba883fa5f2d6561bef8e9c44e32be277b2e29126337852970a46da02
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

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://lozipotod.ru/strik?utm_term=how+to+create+a+popup+form+in+wordpress PDF link annotation
    • https://cdn.sqhk.co/dubutemaruxu/2bdjwgc/download_toca_mystery_house_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_6004bf5946cb6.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/chcxgeD/anime_stickers_for_cars_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/ie6jh4g/77209756635.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/2jghVij/guide_snake_io_worms_zone_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/VhfDv4s/53313363488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_5fe35733a60ea.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/8324541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff625d6d2e9c.pdfIn PDF document text
    • https://luwosixikitap.weebly.com/uploads/1/3/4/6/134628352/nisigemugaxo-jonivazoliweni-wabiwopamur.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/iUDhg1G/nuvumosatedenujoxemedu.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/hdruigv/judapedubutosekiwego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_60279920459e6.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/woxotopapozokev/42669643449.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_e5419ab90b164a0bba531b4d04a3d46f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xopugup/jojowinot.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_55b1cb01d1524defb2453ef76d37a4e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/hesss_law_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/need_for_speed_rivals_ps4_trophy_guide.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_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 5320 bytes
SHA-256: 8d5ae53a1884a088de1139eea9ae243ea65f151b0d9d9f83cb17d05e7b08aa02
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 11132 bytes
SHA-256: e85ec4a0080af668f5882d5fbb9c46d9d4d42d68b86708b1d83914d6d1ee9b66