Malicious PDF — malware analysis report

Static analysis result for SHA-256 802013427846c48e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-06 14:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 023b068edab548b7606a86d65c92b7e8 SHA-1: cc84ed98853c2e35e77cc56fbc6c7ca31eadd64b SHA-256: 802013427846c48e622128cdd84c66168810fa6666ad713fd258991eeef97c01
254 Risk Score

Malware Insights

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

The PDF contains numerous links designed to redirect users to external websites, a common tactic for phishing or malware distribution. Heuristics indicate it's a malicious redirector and part of a link farm, suggesting a phishing lure for free downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=automotive+grade+linux+vs+android In PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5ff88cdcc020a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_60399b1bec7e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_603572b0df090.pdfIn PDF document text
    • http://reabook.online/647471954446ok45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_606bdb552e0f4.pdfIn PDF document text
    • http://good-production11.site/418332129151aeb7.pdfIn PDF document text
    • http://lyudi23.ru/jibezi8msni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_5fc64343dd8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_606a608fec2bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_5fe80ab92cf92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_6040587fd13d9.pdfIn PDF document text
    • http://pinerapidsrr.com/biometric_voting_system_pptlfcp6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417139/normal_6000cbc236fad.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/tazibabebamep/lijukuzifa.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/77187057108.pdfIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_b377e97f1ccf46679675fb6d002b9b60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batiku/siwaj.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_d91fcf6ec23344d781c92f87ecebc0c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/dimijopusigisoredo.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/browsec_free_for_firefox.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_efa1dd7e85b94ab5aa8d5076070c3105.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/71479673403.pdfIn PDF document text
    • https://7dad073a-5858-4d13-bf35-a645d3acb044.filesusr.com/ugd/71e439_b31c62009009499688c9c6fec113986b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/47499286188.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_db6cb9ae869f4d4fa4e2550b367c683b.pdf?index=trueIn 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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5260 bytes
SHA-256: 821e32fab8b23749f66f057e88fcc97371dc690c2cb67a4db3f254ce141a94c9
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 11148 bytes
SHA-256: 00f5d9b553721e364ed41ce19925f72b44f870d2d0e1489c72776173ea902e28