Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e36252801bb8310…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 18:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83254778cc434de5b25f4a45677f2cb3 SHA-1: 7deab499c55808fa60774279d43f49d92121924f SHA-256: 3e36252801bb83102fad1e2b7dfd7e86bf4ff9da8e79c498ee63233b5dee51ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to file-sharing or personal hosting sites, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF's structure are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9561

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://golowaki.ru/award?keyword=thomas+calculus+10th+edition+solution+manual+pdf+part+2
    • https://wibosopepizasu.weebly.com/uploads/1/3/4/3/134332643/9bcf94.pdf
    • https://cdn-cms.f-static.net/uploads/4483623/normal_602094c5e8f11.pdf
    • https://cdn-cms.f-static.net/uploads/4380073/normal_602466c612a51.pdf
    • http://boxojov.22web.org/63923309233.pdf
    • https://cdn-cms.f-static.net/uploads/4465142/normal_6019834dcb676.pdf
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/doxod.pdf
    • https://dironirodog.weebly.com/uploads/1/3/4/7/134760169/miwofoxolitep-zarimabidoku-dovepu.pdf
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/zafexijojoxokomexi.pdf
    • https://mipupupomekux.weebly.com/uploads/1/3/2/7/132712043/defowipopeli_garuwagi_wutaroxa.pdf
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/7217154.pdf
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/6929687.pdf
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/ca9df85e72b38a.pdf
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5ffed391b6943.pdf
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fd077ed03510.pdf
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/9449033.pdf
    • http://sununetapa.22web.org/19745580580.pdf
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/5102376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/38a5d47c-19f5-4973-a63b-8750f0f0f7c6/critical_review_of_a_journal_article_format.pdf
    • https://uploads.strikinglycdn.com/files/4ffcd989-3edb-497f-b555-d0de5ebfc49b/10589474080.pdf
    • https://uploads.strikinglycdn.com/files/c2c2c9c7-2b37-4a5f-98b7-b6280451495a/pegavabujelajafujimij.pdf
    • http://zekovulelopur.epizy.com/lanudifanirowun.pdf
    • https://uploads.strikinglycdn.com/files/24d62767-438d-4e61-83ad-5dd7833d130f/62313266173.pdf
    • https://uploads.strikinglycdn.com/files/9707bc32-7e04-4fab-9847-97fbcf9fe83a/linksys_ea6500_vpn_setup.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bf.bin
abe530713b922bfff46663872d5278bd8944f82154c30e108fd216db9c757b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5552 bytes
font_01_sfnt_off0000f970.bin
8c4ad74a2a23e0925c913288ad21df1c6585a856312744abeb41f46dd6553b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 13700 bytes
font_02_sfnt_off00012762.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 4324 bytes

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