Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e05a56e3b6ce91e…

MALICIOUS

PDF

74.4 KB Created: 2021-05-25 13:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cab702786bd0587889404b226793ea9 SHA-1: 1e64412794bd522bbbeda5709f2c97a5b16bedf8 SHA-256: 9e05a56e3b6ce91eb5b1db92b4f1422879d7eb98dd096e9855322b145b294ad1
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL likely serving as a lure for downloading further payloads. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=mechatronics+textbook+pdf+download
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fe94b847b033.pdf
    • https://cdn-cms.f-static.net/uploads/4500669/normal_604dd0e281616.pdf
    • https://static.s123-cdn-static.com/uploads/4503033/normal_60052278ea440.pdf
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/lirogiwoburekafid.pdf
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fdfbded653f2.pdf
    • https://cdn-cms.f-static.net/uploads/4446017/normal_601061cf7547e.pdf
    • https://cdn-cms.f-static.net/uploads/4450889/normal_606e91c565416.pdf
    • https://cdn-cms.f-static.net/uploads/4379856/normal_6046833635fe3.pdf
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/54f8e7.pdf
    • https://diwamelebo.weebly.com/uploads/1/3/4/1/134108813/3178583.pdf
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/jopuxewitovuwu_lubejolijapibew_gakixopekipib.pdf
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/4852547.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ee359053-0114-4797-9720-547b9e5694b9/coran_audio_al_houdaifi.pdf
    • https://uploads.strikinglycdn.com/files/ddcc2862-e9e9-46ce-bc2e-88ddc9433020/what_positions_are_considered_middle_management.pdf
    • https://s3.amazonaws.com/minegikukovel/figurative_language_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/27facad3-1467-4c33-b9f5-690e67cd3f5b/24990503405.pdf
    • https://s3.amazonaws.com/bulolimepol/why_are_polar_bears_are_endangered.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_off0000e481.bin
32bfb6094592145448752577a9f2c4f7d1efc20d2bd06ba9aafb9120ce3f5e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 5612 bytes
font_01_sfnt_off0000f7b1.bin
7199e266c3ab789e3a18bb2b4f0831b8e14bacc66c550504978d5e1a0ed88a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10756 bytes

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