Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f41a49445f3dfc0…

MALICIOUS

PDF

73.7 KB Created: 2021-03-22 09:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2889bfbdb7e53df583a08c8100e3784d SHA-1: b277502083d8eaaa2ab724dbe279ac7fb58c677e SHA-256: 4f41a49445f3dfc0eed5e2d07f77078e4743db50dba4b8f73933ed3b9d2755b6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to a service manual, which is likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=2006+evinrude+e-tec+115+service+manual
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/lasilirub.pdf
    • http://lopixerirerenex.mywebcommunity.org/buku_akuntansi_biaya_mulyadi_edisi_5.pdf
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/2450dee8b15abd4.pdf
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/gawopotusufumovil.pdf
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/joxosogin-guzesaxu-kojawe-tujafedusonol.pdf
    • http://cocobeautybar.ca/615935932922rrd3.pdf
    • http://edarudost.online/baptist_distinctives_book9femv.pdf
    • http://hiziryigit.online/kesefebakilazupowon63.pdf
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/44b9d77bbe6259.pdf
    • http://summer-italy.fun/apokryphen_johannesf6lgc.pdf
    • http://itabody.space/68876727369z7cli.pdf
    • http://ipatovaalena.ru/994360037658ddfq.pdf
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/9e63022188b.pdf
    • http://pasetbs.xyz/55225688100156rc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_3f2f90d30c2a4814ba893f88e0bdb075.pdf?index=true
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_30cd6b19cfb4495998b81dff0d4a690b.pdf?index=true
    • http://zobuwijezad.onlinewebshop.net/pawajabuligov.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_8b7672314ce245a6a8b756090acd3644.pdf?index=true
    • 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_off0000e0b6.bin
eebda058edf3cd0439cf345e78a4bc5ac44b82d6b08d3cf70a9ba2e448a99f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 5684 bytes
font_01_sfnt_off0000f40d.bin
6f90abdf0c4021a45813e9215396b69ef9bd6f8e6edfccfb2a362ce16f20e214		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 11160 bytes

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