Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b71dcf1e0682c7…

MALICIOUS

PDF

66.8 KB Created: 2021-03-04 12:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d613c851a73cd660e82123c19f8234 SHA-1: df00c4e65c2dc912b49585d7d7b1214322c21d56 SHA-256: 40b71dcf1e0682c7e3127d53f14f1ab3b3725200b93f5e132f86468d63026835
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to academic materials, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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://resalured.ru/strik?utm_term=aqa+a+level+chemistry+specimen+paper+set+2+7405%252F1
    • https://cdn.sqhk.co/mekaxosur/dfjbdje/las_vegas_tours_to_the_grand_canyon_skywalk.pdf
    • https://static.s123-cdn-static.com/uploads/4377113/normal_60001a1f6dc68.pdf
    • https://cdn.sqhk.co/fafojipedul/Dgfihhb/gegumavupaw.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_601de2bdeaff8.pdf
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff777d598455.pdf
    • https://cdn.sqhk.co/vixukose/nhbm50C/mars_leisure_football_scores_pool_result.pdf
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/9dd6c6b.pdf
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/4a1777a58c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://minizadoku.epizy.com/gafegaropotanugebiwe.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_off0000c6df.bin
db3afde5bcf3c39fd8cdceaa158414a3ab335bd810c407d0f15934a4f954b15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 6104 bytes
font_01_sfnt_off0000dbaa.bin
c374db58faaee03083146cf1ef576a18a2d072215aeb63d627a1ae9874e9bc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10272 bytes

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