Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f32eb6f5ef9ae6…

MALICIOUS

PDF

70.3 KB Created: 2020-12-24 11:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c840a89ca6b579fc93cc31c729cf96e2 SHA-1: 7916cc7ac28cffc7673ae77a8a7e73800e20320a SHA-256: c1f32eb6f5ef9ae60569ec659d7968e99b75c9d6b42e6b2714348a045969ac50
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan distribution. It contains a large number of external links, forming a link farm, with one prominent URL suggesting a lure for downloading an 'unlimited apk'. While no scripts were directly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffi.ru/strik?utm_term=download+dead+in+the+box+mod+unlimited+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470841/normal_5fd8b2b82ebb3.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/xosexoxu_raxuruse_tofasulefulud.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/8724715.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/sgcjbt0/batomipasupawegibajaxiji.pdfIn PDF document text
    • https://cdn.sqhk.co/kezulegol/ilgeaid/ujala_radio_fm_frequentie_den_haag.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/dUchgwB/transferwise_money_transfer.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/ibWgfjh/rainbow_stacking_bowls.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/44d4208e-8e52-47d2-a101-51288779d6ba/nejenatinumafefer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd808ea-c23d-4ae5-b9e4-2b0070949eb8/sijezemami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fb33e0-f8f1-415b-b840-00b22730936e/zevegovuzukawawetimuked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa05fc6-fef2-43f1-ae59-2eae2444d2c1/skeletron_expert_mode_1.4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb49229-e514-4820-a01a-3d54e158e2fb/46981178218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0205057f-21ad-4a91-87b1-98030480124e/52917038511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43bb041e-344a-44ea-bc9b-f8d6b46686ff/power_problems_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 5288 bytes
SHA-256: 99d64a0a1172cba231c076cb5dbe9f910d6f15ad12b4d1d09bb0f9c3dbf1e0e7
font_01_sfnt_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 14116 bytes
SHA-256: e069d62b3b68507270496047a554ffc459e91e9c02fb3ab36cee1d853a9d141b

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