Malicious PDF — malware analysis report

Static analysis result for SHA-256 990804adb6ddc5a2…

MALICIOUS

PDF

67.5 KB Created: 2021-03-30 15:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a201fca0a3e271f221114477e0be1f1 SHA-1: 584fa74c93cc035bbbc914311aa6067839a84986 SHA-256: 990804adb6ddc5a2610cf67fb9c8fc626d517401c15542380dcca1cde878e943
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

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://nipisod.ru/wix?keyword=crosley+stack+o+matic+record+player
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fcdd4001930c.pdf
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/3938214.pdf
    • https://static.s123-cdn-static.com/uploads/4447460/normal_6009017a81c50.pdf
    • https://cdn.sqhk.co/dejuxafe/Xgh6Vlt/32550933305.pdf
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/9652458.pdf
    • http://xivobivivupe.mygamesonline.org/critical_analysis_of_the_road_not_taken.pdf
    • https://cdn-cms.f-static.net/uploads/4453888/normal_604b4532b855f.pdf
    • https://cdn.sqhk.co/disumuneriva/d6Ogeih/69658098787.pdf
    • http://nibajafij.medianewsonline.com/99435670552.pdf
    • http://kojanusipesipe.scienceontheweb.net/arrangers_publishing_company.pdf
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/4387176.pdf
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff6c918aea4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_31db9c8c7df9463f8c1af9f3010e8b2d.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_8dad765e06014a098a510d34be927658.pdf?index=true
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_0f05467a74454f1a888e112bfd20bd0c.pdf?index=true
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_665c5fe382d7416b9f5080e2908552f3.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_7cbfeeb34fb54b6b95192d8030327761.pdf?index=true
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_eac665b72f774bee8fe8db279b995d8d.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_cbcb3b01c0d240efaf952ddb6fcd8e42.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_off0000ca06.bin
908d6302aee28f47dfa4446ec8ab2ac1a1b482cdc3b51ad087df0fd6aedc1831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 5288 bytes
font_01_sfnt_off0000dbf6.bin
7c970cca505a777923ce74279f2d5dce93166fdde9c79b9bbb980ff0f110ae5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 10316 bytes

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