Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b75a134ce3eb9c1…

MALICIOUS

PDF

81.5 KB Created: 2021-03-30 13:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5344f0b2ff36db51c6040a69a0f39b50 SHA-1: 0f8d4f214c8c148b395b1bf5317af50293163140 SHA-256: 3b75a134ce3eb9c139ede372f1114f28afa6a7439049a810df0af61533c66ce2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://gimoguvi.ru/123?utm_term=bj+novak+one+more+thing+pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_605879d0d733e.pdf
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/1740985.pdf
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/e4081ff03a048.pdf
    • https://cdn-cms.f-static.net/uploads/4486743/normal_600c903276b98.pdf
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fefe5699f077.pdf
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fc6da9e9d9c4.pdf
    • http://viziziziv.mywebcommunity.org/46704478354.pdf
    • http://fewudutizoxom.medianewsonline.com/27225695813.pdf
    • http://duxogesubuz.22web.org/digital_multimeter_dt9205a_manual_espaol.pdf
    • https://cdn-cms.f-static.net/uploads/4488335/normal_601e8a28b9008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05782a07-2797-4707-8a7d-f33ae152dc0a/natidilojanexerowiwag.pdf
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_2bc6b09698c94a3ca73f70c90a5ce19c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fcccb9df-64dd-44cd-9413-033ba0c4fe01/makopokaz.pdf
    • http://nerozufigepa.rf.gd/fuwajexereleg.pdf
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_f21eeef8f6da47d2ad712fa5d23975c4.pdf?index=true
    • http://dowisekek.rf.gd/jubejisaxetikapabaxukuser.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_8395346492ca4813a754296443a2b62d.pdf?index=true
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_a25604b97f80483299ca7ccf6e96007f.pdf?index=true
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_e87011efcd5342d8b796b325dacf693d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/468b5d23-90fe-4360-a2b0-7928b3c67c3d/60256272876.pdf
    • http://pabotojixupi.atwebpages.com/dedarevikurusivo.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_off0001013c.bin
fd4d39e9b42f5bf65d2087f263843407a1469c321f1216821660b2cdb9eae65f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 5492 bytes
font_01_sfnt_off000113e1.bin
dedb11ea2e03fab9916792036fd976152b73e36dc410bdde0f28b31decffbec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 10860 bytes

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