Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09d81c8cd15a2bc…

MALICIOUS

PDF

70.5 KB Created: 2021-06-01 06:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8da5a8ca0594661114b320bdb95a60c1 SHA-1: d0df2c04af46949912e0f1ec01c197e7d1eca43b SHA-256: d09d81c8cd15a2bc2c83d518f8306f713d5f2c3ab3466f4f7b34678eb9a2e84e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URLs, 'https://smidgel.ru/pbw?utm_term=clear+bonding+primer+for+tile', is flagged as unknown reputation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure points towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/pbw?utm_term=clear+bonding+primer+for+tile
    • https://static.s123-cdn-static-d.com/uploads/4443342/normal_60b592bdc34f4.pdf
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/laxivopojoxu.pdf
    • https://cdn-cms.f-static.net/uploads/4417025/normal_60402c28345ba.pdf
    • https://jikowizovogowo.weebly.com/uploads/1/3/2/6/132682153/nogutokotikopaj.pdf
    • https://static.s123-cdn-static.com/uploads/4461746/normal_600493df11cf7.pdf
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/gudewovesitokuj.pdf
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/pafilo.pdf
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6038d2702fddb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kelivesas.pbworks.com/w/file/fetch/144442122/how_much_oil_does_a_16_hp_briggs_and_stratton_engine_hold.pdf
    • https://uploads.strikinglycdn.com/files/7f584014-e3b8-4582-98b0-bc10f015ef61/sukogatuvu.pdf
    • https://uploads.strikinglycdn.com/files/2f0a83f5-9489-4553-8131-57681d1a3d93/gunususanopolutuwuwazezed.pdf
    • https://uploads.strikinglycdn.com/files/a7bef746-4e48-4946-92bf-b035274a810c/how_do_you_crochet_a_magic_circle_step_by_step.pdf
    • http://jopamedet.pbworks.com/w/file/fetch/144443148/ilyada_ve_odysseia_konusu.pdf
    • https://uploads.strikinglycdn.com/files/d9851a02-1b28-4bfa-a64f-718eb1364ed6/xonijevasefagupotudi.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144428844/fundamentals_of_management_8th_canadian_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/50c3e3d1-f0f2-44cc-ae58-a14318d33595/pobatilu.pdf
    • https://uploads.strikinglycdn.com/files/017e989e-5ed5-44a7-b0a8-faee81f3beda/61642379958.pdf
    • https://uploads.strikinglycdn.com/files/5b6ccd5a-fe71-45d5-aeb4-7e92f467e688/what_is_the_purpose_of_a_quitclaim_deed.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_off0000d5c9.bin
d2cd4c879ee70fc0bf6ff5e9022ccbd4ff669141594e46e9186f33f835cc981e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 5228 bytes
font_01_sfnt_off0000e77a.bin
b5297e8807cd37f3a8406594414423c8eaec9d9e85d1548bd040044741e92512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 11164 bytes

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