Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59e3a5daeff80ef…

MALICIOUS

PDF

75.3 KB Created: 2021-03-27 22:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e4fbb6c132e62cf0249f67c765b323dc SHA-1: 7a8060bbac8cf8ee5c49714f294953b9bbe07a30 SHA-256: b59e3a5daeff80effd399b67c217344cbe22718e1b4c5331f8784b0096127f3b
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 as a link farm, pointing to various PDF files. One of the primary external URIs, 'https://mezovuduw.ru/award?keyword=buddha+books+sinhala+pdf', suggests a lure related to book downloads, likely to disguise malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://mezovuduw.ru/award?keyword=buddha+books+sinhala+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6020a67c2ef8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_60323a18bb1ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_603060b1d89d7.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ieAjacc/ludo_game_program_in_c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_602f60f4a32e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6054524cc444b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_602d049db7c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6033d30db0882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_603ad3cc68779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_603ac84c8e767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600b4f625d8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb909b6c73.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/Fhjggic/57987082563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fce2d284f986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5ff5d183728a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_b17c23bacc3546b6b26071600f681917.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_b4b9f54a78134a2ab31ba4ce732f2941.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/core_animation_programming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/maharashtra_state_board_11th_information_technology.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_d2a156464cf54de2b7852997cb3e5b0b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 3972 bytes
SHA-256: d38fd7dce9c589a8391e4e2dcdbf83e2206cc8ce77c18388f529f25fe991017e
font_01_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5284 bytes
SHA-256: 0d35e4853dab5abf6ba37bb9d15a762e94410fe456aa5a016b7baee0fa69e64f
font_02_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10664 bytes
SHA-256: 80ce85ce88290e98257e497370dc9baed3859992d035ad8617bc44971109fd9e

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