Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eea084bb7bff85…

MALICIOUS

PDF

98.6 KB Created: 2020-11-29 12:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d121f8a6fe36353382b0788c92ab00d1 SHA-1: 12f2499b6da5f7ca7fbb15dd7c0867179cbeb0ea SHA-256: 81eea084bb7bff85da5df867d913493b7ce1d39f978f4de2c1c55db521681f3f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=codehs+answers+activity+1.16.2 In PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/rizodomurerixo_kulonanitizi.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/2432978.pdfIn PDF document text
    • https://bafafodalub.weebly.com/uploads/1/3/4/3/134367540/9550420.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/dajikemoxalij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c07b0ebe-168c-4195-a8d7-d152a60640fd/legal_seafood_boston_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47afecdb-b185-409a-b92a-438616bed24e/63096382360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ab7681-f677-4fe2-b029-d2dd0053e7af/togos.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/79618757517.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/critter_control_gainesville.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb937047-836d-4d8f-928e-5789c74c9c39/thimbleweed_park_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/kennen_guide_champion_gg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce05a159-b3b3-436d-adf7-0c9824e41474/modern_calligraphy_alphabet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94da70be-6b63-431d-92b4-2c22aca564ae/kegikiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7738ea6f-bab9-4f8e-aafe-d17d6cb51cd6/chevy_bolt_price.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 21792 bytes
SHA-256: cc951f4f558887ac6c68717ad2bce530add855cfcae1055a673a4d45f8f879f7
font_01_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 5428 bytes
SHA-256: bcc5985041ad13cb0a3af87ca6a82c22980839ee45c71116a8840bcb61182b73
font_02_sfnt_off00014a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5B 10844 bytes
SHA-256: 009f4e83768b91fce8b468385a32b6d01e35891b843c3800f37b083a7ad4797f
font_03_sfnt_off00016f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F34 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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