Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4f3d8d7e68670c…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 02:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c06764b17a620741929b09fda6562c7 SHA-1: 20270a6a9444657806a28608d55e4c6dc20e1721 SHA-256: 8f4f3d8d7e68670c24c84ad829dd65a16f6ec838cf05d766d1126fd7e7afdeaa
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://golowaki.ru/wix?keyword=contour+lines+worksheet+ks2', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily corrupted, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=contour+lines+worksheet+ks2
    • https://static.s123-cdn-static.com/uploads/4413462/normal_5fe185013bff3.pdf
    • https://cdn.sqhk.co/pozusonitid/gjxjeRJ/56653317037.pdf
    • https://cdn.sqhk.co/demanajinu/GlLvhh3/mozevuvifudigavupa.pdf
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fe8a4c41c598.pdf
    • http://rakapugijumub.sportsontheweb.net/kilotixulibenakozotuj.pdf
    • https://cdn.sqhk.co/fuvavegipap/bG54jbk/95213694942.pdf
    • https://static.s123-cdn-static.com/uploads/4415291/normal_60045a6e8738f.pdf
    • https://cdn-cms.f-static.net/uploads/4487641/normal_604b35363ddf9.pdf
    • https://cdn.sqhk.co/pulazapusaw/iggge4S/22846996423.pdf
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fd66400dedbb.pdf
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fe120806076e.pdf
    • https://static.s123-cdn-static.com/uploads/4500667/normal_6007bc2c33338.pdf
    • https://cdn.sqhk.co/difigobon/dthbeic/spiral_staircase_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kexafobe.rf.gd/diary_of_oxygen_thief.pdf
    • http://vumamuv.myartsonline.com/korajugede.pdf
    • https://uploads.strikinglycdn.com/files/6484b850-2b20-4bbc-9155-83a73b4775cb/60344716771.pdf
    • http://zunakaduwuba.rf.gd/40038117996.pdf
    • https://uploads.strikinglycdn.com/files/61053c51-29c0-4ded-810f-2d67f9ae450b/jadekufukobuwubufuxeg.pdf
    • https://uploads.strikinglycdn.com/files/9107cf95-b753-4f1a-9235-9ddf80bb921a/dusodawowetada.pdf
    • http://fozubada.rf.gd/toxic_blowpipe_jad_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88c.bin
0b56223e8501584baef98da5ad12fc5af22a2069bb17880b142c00c31e027fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 4756 bytes
font_01_sfnt_off0000e8c8.bin
ad608304cd4cad65a07dcb3648efcdee7ee484db4b256e8bd17f0ad180960b82
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 10212 bytes
font_02_sfnt_off00010bca.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 4324 bytes