Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4378786faff74b5…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f8d00a62ea60cdfa3240f4bad14f0f0 SHA-1: 8f1f96bd909d1070b4f1ac895e66aee6dce5b1ba SHA-256: d4378786faff74b56396d6f67d9a796908fbe29c7783d6eb7b97c608c5431a26
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to malicious or spam websites. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of many external URLs points to a redirection or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=mitosis+online+lab+answers
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/da66aae.pdf
    • http://top-agent.ru/zujojejigowonoflz9pi.pdf
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/sefasaviwi-nulibi.pdf
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/soviwepitukami_lipusowis.pdf
    • https://cdn-cms.f-static.net/uploads/4375080/normal_605259bbb5906.pdf
    • https://kololopobiro.weebly.com/uploads/1/3/4/8/134853362/vekoj_zejab.pdf
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5ffb043b48b24.pdf
    • http://all-gopro.com/quartile_grouped_data_worksheet8n024.pdf
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fe595f388fa4.pdf
    • http://circulshtangcalip.website/leadership_competency_example_answers_civil_servicem291b.pdf
    • https://vunejodi.weebly.com/uploads/1/3/5/3/135382889/056647e5e.pdf
    • https://cdn-cms.f-static.net/uploads/4413118/normal_602f1d211869e.pdf
    • http://good-production20.site/681571150842p58k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_2d49b003ea6a4331b6c60b71ac645a48.pdf?index=true
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_1559c5b862b04179958ebf4f36a0b5eb.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/juliette_gordon_low_coloring_sheets.pdf
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_1afa55d8ab144e938f677a8d20a126a9.pdf?index=true
    • https://s3.amazonaws.com/gedexim/wpf_treeview_hierarchicaldatatemplate_selector.pdf
    • https://s3.amazonaws.com/sajatofubote/answer_for_what_are_you_up_to.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_eac743420a0e4b298d0e8998752c3a37.pdf?index=true
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_206778dd7c2e4e31adeacf1809905953.pdf?index=true
    • 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_off0000e358.bin
08e929268c4ad7f10183ecf314c739b2212ba9bf00523782b3e7b2cab4757393
pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 4916 bytes
font_01_sfnt_off0000f43a.bin
b43ec1001887e01024cfef66a43facf9b6e4904e43998c0eb37401a1900426eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 10736 bytes