Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc3abb140137c3a…

MALICIOUS

PDF

120.9 KB Created: 2021-02-26 01:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f444f44ef8964464bdf6b0d862d843e7 SHA-1: 0d304eb29c60925e58374985bc88f9fef8e3ea62 SHA-256: 1cc3abb140137c3a65799bc54d89211f2ee677a43b6d99e9aa4f3d7b7c694f15
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and file-sharing services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution disguised as legitimate content. The presence of numerous external PDF links suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=pride+and+prejudice+1995+rating PDF link annotation
    • https://cdn.sqhk.co/tuxonewebuke/jefgciA/dudoxasili.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/tuxewutojeki.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/c7IQljg/refesisuwolafefanivupamib.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/jdidjcS/commercial_bank_of_ethiopia_mobile_banking_ussd_code.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/hhijfNe/stadia_controller_bundle.pdfIn PDF document text
    • http://nutristrike-shop.ru/rukifosopowimud16ot2.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/hNhjPja/35041275302.pdfIn PDF document text
    • http://repair-foto.ru/sasiluvuvol09ij.pdfIn PDF document text
    • http://whysmall.space/injustice_gods_among_us_comic_year_5oigk8.pdfIn PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/c376ad5128adafc.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/GphdQfF/lighthouse_point_marina_wildwood_nj.pdfIn PDF document text
    • http://runmasten.online/teketufowuwudakeso4knol.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/225361d.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/B0u2rid/dubaxuvebexek.pdfIn PDF document text
    • http://lifegirls.site/kenmore_dishwasher_665_owners_manualupuhk.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/wavuzozitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000199ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199AD 5440 bytes
SHA-256: 7de06f7e775d1de2e133107b2805c7628767e110e328965289b3c6d686167541
font_01_sfnt_off0001ac4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC4B 13068 bytes
SHA-256: 424ea75bafdf8653e72205fa010adb38d19bf7d0c7ee573932dea4dc14f30c34

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