Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03a1558627b0fc0…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 02:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd7de9388633704b2c53c8a7c64ad2ad SHA-1: b579b70ee40421a3d187fbf7d106bbf74df5bef3 SHA-256: b03a1558627b0fc04bef946b7d5702abd6a7f562410a1cb8668964bbab5e3ed4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified as a link farm, with a primary redirector URL pointing to 'baarspo.ru'. This URL is also present in the document body's metadata, suggesting an attempt to disguise a phishing or malware distribution lure as legitimate search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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=martial+arts+classes+near+me+with+fees PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5fe99b53ac797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd60bcdd57fe.pdfIn PDF document text
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/dekofojezekaga-doniwo-xizeb-tujesirasaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418973/normal_5fc9f64d06d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_6029729be7e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413120/normal_5ffcd70bc107e.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/heEECjd/5820318160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_600da592e0ba7.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/hxrhemN/sozozev.pdfIn PDF document text
    • https://relitaju.weebly.com/uploads/1/3/4/8/134888942/b969e34a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd27438c8407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60163701ce54c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec3bc26-c901-41d8-9e57-230aa163a6ce/34222354417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fa6464-7bf4-4b96-9e4c-52acb0611727/nejerasufafukifujorola.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/nomibenepamojeken.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/93716220364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5fe614-396b-4fbb-919b-943b5fc3c54f/1563134153.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/ruberenokegaf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 5216 bytes
SHA-256: 36ee83ba34f4784ad55dbaa09854ee9aff460e4cf44e27e39926dcf5ad2b125f
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 11352 bytes
SHA-256: bb7a96bd30d1e35de91a63f46894c4c800d6f75beaf9b93f7e627b3de53d4ffe

Open this report in the interactive analyzer, or submit your own file for analysis.