Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03a86d6bfc587cb…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 01:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76a892a2f1644e76475e3c1e63d1b47 SHA-1: a360939ea7f3329860a53931be18dae5df8d3a40 SHA-256: f03a86d6bfc587cb4f2b67f06168c12b33a6a6c4ff3cbc6b69b44af310bc6fd5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to other PDF documents, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://leonvi.ru/wix?keyword=ucsb+education+department, appears to be a lure for users searching for educational information. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=ucsb+education+department
    • https://cdn.sqhk.co/tosobulig/ehgPjeg/jozaxaneragid.pdf
    • https://cdn.sqhk.co/mapelimujeku/hf9yv89/73300205951.pdf
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5fdaef590c338.pdf
    • https://cdn-cms.f-static.net/uploads/4456999/normal_60442f387a5d4.pdf
    • https://cdn-cms.f-static.net/uploads/4421461/normal_60474d547910a.pdf
    • https://cdn-cms.f-static.net/uploads/4379038/normal_604b4794e4960.pdf
    • https://cdn-cms.f-static.net/uploads/4426549/normal_603364a418e31.pdf
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5ffb0ab391ea2.pdf
    • https://cdn.sqhk.co/zerumowo/yQhiyaW/nisumumobazigizikadukedi.pdf
    • https://cdn-cms.f-static.net/uploads/4458848/normal_604fe0d329f5b.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_6017437637e10.pdf
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd10bb139d5c.pdf
    • https://cdn.sqhk.co/bexuxoxabim/ifhhryo/pizokiginofigesapuxi.pdf
    • https://cdn-cms.f-static.net/uploads/4448332/normal_604394e85dc4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_a234098a778d4ef883fb34136434bb5e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/004d9c95-87b3-48c3-b93d-76d61da75697/77508242112.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_a5d685b3e0634e44a38514702687a452.pdf?index=true
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_74e4e79c5f774390bb5a8952289a434a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e1bc945-a55c-4079-9a5b-f3c67a61b1e5/88901639197.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_off000116f6.bin
3da54bb45ebf9385109b99d029743b222f707591156bb2bd72fe7e6adfb16c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 5320 bytes
font_01_sfnt_off000128f2.bin
307156308d1220599b7c66c44ac3b55d38042ebf1b16756aa6b0fed8974dd28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 10488 bytes

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