Malicious PDF — malware analysis report

Static analysis result for SHA-256 989895c4f461d8bc…

MALICIOUS

PDF

81.5 KB Created: 2021-04-03 18:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ff7733feef0b92c3bf411042a1e985b SHA-1: d7f1b980cce90c869002d42f231ce4412775a061 SHA-256: 989895c4f461d8bc5a12a749fd7c991805d606b432d984a50b5a20e60e6a0890
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating a PDF link farm. Numerous external URLs are embedded, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=la+luna+sangre+july+12+zodiac
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/cb1b7356094d6.pdf
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ffc4863cecc8.pdf
    • http://ketaton.mywebcommunity.org/defensa_siciliana_variante_sveshnikov.pdf
    • https://cdn-cms.f-static.net/uploads/4478669/normal_604a87b6524d5.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_6037ec3d80355.pdf
    • https://kopepadozuko.weebly.com/uploads/1/3/4/5/134505487/piwipiwelajave.pdf
    • https://tedevonefuses.weebly.com/uploads/1/3/4/5/134528644/dd3d94839af87b5.pdf
    • https://static.s123-cdn-static.com/uploads/4366306/normal_5ff4a4986de6c.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/nosilujidulu-ziwuperisuma.pdf
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff506bdb07a8.pdf
    • http://doxedisipi.scienceontheweb.net/wadegabeboxorapivojupolow.pdf
    • https://cdn-cms.f-static.net/uploads/4449192/normal_60568aba2986d.pdf
    • http://xabudumame.mypressonline.com/youth_mental_health_first_aid_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4387807/normal_5fede7c9bf396.pdf
    • https://cdn-cms.f-static.net/uploads/4383451/normal_602407891631b.pdf
    • https://cdn-cms.f-static.net/uploads/4368251/normal_60435a9f888a2.pdf
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fcc244e9dce3.pdf
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/2464815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_de0b24b84f5a4b7d8dbe6affae48344e.pdf?index=true
    • http://pedirite.onlinewebshop.net/what_is_bill_of_exchange_definition_in_urdu.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_0ede76112f7643338a25d1a0c14e31d4.pdf?index=true
    • http://litorow.myartsonline.com/sarojurujugiwojujagarofi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89c.bin
0dd1ddca011bb656db3bdc2e4e33d4e6a31139a2677f61f24e45d0a90dd60986
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 5460 bytes
font_01_sfnt_off0000fb57.bin
04b3a63ea8056d7e3a9c1fd6d62e654dc3c34cac057c6d2f22f4047ea778a1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 11792 bytes
font_02_sfnt_off000122e0.bin
9f4914eee661b0ee52b7d56f83ca1c0c111f1c5d0cc5f10efe511803eb69212c
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16176 bytes