Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d3107a4c4d1b95…

MALICIOUS

PDF

74.9 KB Created: 2021-03-08 18:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a27f3c7fc08e34bd3110ae069aba9908 SHA-1: 876cfecd82d98f10b1a06c6bcc1f64c57536648c SHA-256: a6d3107a4c4d1b951b45abe7f3ed7f36e7054c25ba9be48b82a46586f60a9a3f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'dafemum.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/123?utm_term=adapter+for+android+phone+to+hdmi In PDF document text
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/537506.pdfIn PDF document text
    • http://dezirutumevolu.iblogger.org/vipeveri.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/mosol.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/demaj-xuvexojag-matavopavixa-tabeval.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/dakeledekefa-tavowedujo-fuzera.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/lixuzo/52800346920.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/76295789209.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_439f93516be94fb49a22040435e36aae.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_11dcccbc610e4d63b44176b06cc60e73.pdf?index=trueIn PDF document text
    • http://mujujum.epizy.com/faripiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c93bb90-d03c-4554-b4cd-0674e64827c0/stock_investing_for_dummies_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/mowexigadafedoduti.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_ce85206314d64a42952c5d6d82460106.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_e7cf3ef5485045899cb57d6b4b8cd433.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/14505353104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07108fbb-7af9-4231-970c-0d97f8244ba8/motorola_sb6141_turn_off_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c54e775-e1ef-4401-a3a0-7abe120657fd/taranis_qx7_access_vs_accst.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_8ddd9fec7b5342a4a0b447916608d754.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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 5060 bytes
SHA-256: b008cacb800e4002d01f434957b60bb67c8f396382880a073054a7eb754bc6fa
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 11228 bytes
SHA-256: 6bd9140a08280bac2ec9516a9716ac126f7490072e4afc7ec4f9d4a56eecebd3

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