Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97ec03ff55e7670…

MALICIOUS

PDF

75.1 KB Created: 2021-05-30 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012295b0b541c50acda23529798d6d80 SHA-1: ac59781b436613f9ab3c44735d67c19718e80a62 SHA-256: c97ec03ff55e7670189549453107564af40d23783c98c0f0db04fa3d4e0b7684
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=report+favorably+definition
    • https://tobisimotar.weebly.com/uploads/1/3/5/3/135330661/mevikomi_sigivexom_popizut.pdf
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/ruzega.pdf
    • https://rafulosuzeme.weebly.com/uploads/1/3/4/2/134234553/35dc7f44.pdf
    • https://xunuvetokogira.weebly.com/uploads/1/3/1/3/131384336/natijotudi_xuzigikobe_luzafonijedenu_tilexuj.pdf
    • https://lutapusudifo.weebly.com/uploads/1/3/1/0/131070527/jexumokosugat-zunekitagebow-ketojeja.pdf
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/2b93f6f6585.pdf
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/tapilikotitisepolul.pdf
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/c913dbd03.pdf
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/tilarefa.pdf
    • https://romidemifavev.weebly.com/uploads/1/3/1/8/131857114/1861152.pdf
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/zorew.pdf
    • https://kuzeposevitisol.weebly.com/uploads/1/3/4/8/134881899/c9f68a3.pdf
    • https://vuvitujenus.weebly.com/uploads/1/3/4/3/134305132/2512157.pdf
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/vunogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1dacb169-d5e9-4a09-a6ae-fb0c1fc5a88f/86404887371.pdf
    • https://uploads.strikinglycdn.com/files/28eb040b-cb50-488d-a159-c4f871d5d276/66842657615.pdf
    • https://uploads.strikinglycdn.com/files/e7f03226-43a4-470c-b728-cb697abf2dd6/sixevukezofawitoge.pdf
    • https://uploads.strikinglycdn.com/files/feb8323d-8d01-4cfb-b7c3-26854196f00f/32840056104.pdf
    • https://uploads.strikinglycdn.com/files/cc63792d-5dd6-4f34-b339-ae3488997549/4_pics_1_word_level_2394.pdf
    • https://uploads.strikinglycdn.com/files/fb5ba783-b042-4894-b0e5-cb2266ee311d/x_core_sprinkler_system_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/8bc1e5ba-4a72-4f8a-9b5e-ed9645cfd4b9/how_to_file_a_civil_complaint.pdf
    • https://uploads.strikinglycdn.com/files/3b583a4c-e352-43ae-8a64-beaeaf352051/6328424323.pdf
    • https://uploads.strikinglycdn.com/files/16edad14-9317-46d0-88c3-33afd6091d70/ge_healthcare_office_in_india.pdf
    • https://uploads.strikinglycdn.com/files/ab46675f-a5e9-4553-934c-88f54b93395d/gudufow.pdf
    • https://uploads.strikinglycdn.com/files/c086ea71-3abb-4289-aae0-0cc6a8a8aae0/73723658805.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e974.bin
1d8b497ee289d7bfc5f7958d2f00458d22cd29b3b35ad320e97b82fea42dc74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 5164 bytes
font_01_sfnt_off0000fb25.bin
2249e5cd277604e457932c6a4a8cd3f00e0e76788763a553a17c7caa0d166603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10516 bytes

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