Malicious PDF — malware analysis report

Static analysis result for SHA-256 0787a9bc2825014a…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 19:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba0ce3e0968845b6b20f204ffd660e3 SHA-1: 7a6de49d49308b856d47f93e8b0b75f85f417e8a SHA-256: 0787a9bc2825014a0ee52ea2d15d561f67241440b41375999a0d7b9b6b34c9a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent URL, 'https://jumiwimov.ru/award?keyword=belajar+photoshop+cs6+untuk+pemula+pdf+bahasa+indonesia', suggests a lure related to Photoshop tutorials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=belajar+photoshop+cs6+untuk+pemula+pdf+bahasa+indonesia
    • https://bufopavebusi.weebly.com/uploads/1/3/4/8/134853568/mipexa.pdf
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/fulozo_wuzegul.pdf
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/2d04f6.pdf
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/ce22ab5c8609.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/wifej.pdf
    • https://cdn-cms.f-static.net/uploads/4492573/normal_5fe8037864445.pdf
    • https://mosaminaworite.weebly.com/uploads/1/3/1/6/131636744/c2d5af1851b2.pdf
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/84190cc6f0f51.pdf
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60149bdacb2cd.pdf
    • https://votoliju.weebly.com/uploads/1/3/1/4/131453024/banaduzejexozibutu.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/caf0e9a8b752a.pdf
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fd84fad535c7.pdf
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/bojinaxoxirona-nitilezubof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94657d8a-be61-45d0-9e69-7c6933891520/milet.pdf
    • https://uploads.strikinglycdn.com/files/d5a5b2cd-5df0-4ae6-83bb-f823191a47db/36997062309.pdf
    • https://uploads.strikinglycdn.com/files/9ef0db76-9ebd-4f3b-a2ea-3e54dd8cb276/rejiza.pdf
    • https://uploads.strikinglycdn.com/files/36c902e8-577e-46de-a39c-bbb0b9a4458a/44410627349.pdf
    • https://uploads.strikinglycdn.com/files/a072aa38-010b-4ddf-853e-e2d7609bd831/26385601802.pdf
    • http://lexupanerosexa.epizy.com/apprendre_l_espagnol_mp3.pdf
    • https://uploads.strikinglycdn.com/files/92a062b3-070b-40fc-a436-2963dc642c29/hoover_steamvac_attachment_instructions.pdf
    • http://lapefub.epizy.com/38745815599.pdf
    • http://tarusuja.epizy.com/baseball_card_template.pdf
    • https://uploads.strikinglycdn.com/files/af27bbf7-f3f4-4ceb-9847-cb476de90bd7/62924686429.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_off0000efb8.bin
c8edc7f61d091d6bfa3fb40e9e50713917056cf434f7f025a660f6279c1f24fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5880 bytes
font_01_sfnt_off0001038b.bin
96d1963a6bc3959042b9d6c8f5daac901086ecbc42c2a5e33425512966cf3109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10680 bytes

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