Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f32b61e5c93926…

MALICIOUS

PDF

80.4 KB Created: 2021-05-21 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bf212da129276dde45959528d2ca17c SHA-1: 9aa3f22b63d97b56627a29614d175cceb028f014 SHA-256: 11f32b61e5c93926d360799ad4300ceb2bff749fb842cadc49256121c929d290
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links. One of these links, https://dafemum.ru/strik?utm_term=how+to+add+perspective+lines+in+procreate, is directly embedded in the document. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malicious content delivery intent. No scripts were extracted, but the presence of numerous external links points towards a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=how+to+add+perspective+lines+in+procreate
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/dabal-luxabisapidu-bikaberalan-vazizutuwit.pdf
    • https://cdn-cms.f-static.net/uploads/4385228/normal_6069cd786a2ac.pdf
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/cb301c.pdf
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbdf5805bec.pdf
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ff65d71a1fb1.pdf
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fe9dbc80442f.pdf
    • https://cdn-cms.f-static.net/uploads/4491426/normal_605c6b9acca8b.pdf
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/5016926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoferuzu/80817652541.pdf
    • https://uploads.strikinglycdn.com/files/b9f2b65d-1178-4ac2-92a1-39fe877050d2/nitro_jpg_to_excel.pdf
    • https://uploads.strikinglycdn.com/files/ae0325d3-e2f9-4e90-8689-dcbe4f78504b/how_to_reset_alcatel_phone_when_locked.pdf
    • https://s3.amazonaws.com/fekife/what_happens_when_the_left_side_of_your_brain_is_damaged.pdf
    • https://s3.amazonaws.com/belapawerezuju/comprendiste_answers_realidades_3.pdf
    • https://s3.amazonaws.com/foneniz/sarosefelo.pdf
    • https://uploads.strikinglycdn.com/files/c7b67c9e-8350-4cf9-9337-9dcb87bd68c2/berexikepo.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/55718931318.pdf
    • https://uploads.strikinglycdn.com/files/32c523d1-af6f-4a3a-b8d4-388c874eeb85/vadunezuraj.pdf
    • https://uploads.strikinglycdn.com/files/94d08cb9-2c4f-4500-9997-3bc507b60126/ps3_remote_control_tv_setup.pdf
    • https://uploads.strikinglycdn.com/files/4cc2bff7-e10d-4b9b-8cc1-34927c04bdb7/zalomesizixopidaxipab.pdf
    • https://s3.amazonaws.com/bakoloj/xukorebavenebisidopuwazi.pdf
    • https://uploads.strikinglycdn.com/files/5af9c8fd-0c8f-4738-96d9-1f030abf65cb/quadratic_equation_test_with_answers.pdf
    • https://s3.amazonaws.com/fedure/what_are_the_literary_devices_of_drama.pdf
    • https://uploads.strikinglycdn.com/files/c8fa30f3-d944-473a-a699-c59c43050245/what_is_urea_recycling.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_off0000fd64.bin
209ca4b1baec822470ebb437460f162cef6ccc6d2b17fe7ff300d3b3c2081b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 5180 bytes
font_01_sfnt_off00010f27.bin
14063dc6ba8f380419ed75f2e6dbae122b567748d1b301df2f9dc351fd7932d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 10896 bytes