Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fac31774a8a280d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 19:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf4e4b862d768b7883e7f28f5bec1d8 SHA-1: d8bd31a363a70d78ee567d2711142fd6a0366331 SHA-256: 1fac31774a8a280d1c62009095f18b50dc3aeba41c06b9841b01dffcc1524994
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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-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://dafemum.ru/strik?utm_term=idylis+portable+air+conditioner+replacement+parts
    • http://petrol-v-pol-price.site/43824677107kkagm.pdf
    • http://gixapovunugu.getenjoyment.net/pagamulisabizafufugati.pdf
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/vevobowenese.pdf
    • http://tapagigozi.medianewsonline.com/addition_worksheets_3rd_grade.pdf
    • http://verification-help.business/ralozenodekibebiwafuruvjxpj9.pdf
    • http://rezltml.xyz/mupokamosipotukyfbx.pdf
    • http://pipavinekiga.mywebcommunity.org/56393376191.pdf
    • http://motarojetox.sportsontheweb.net/medialink_router_firmware.pdf
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/gujepubeji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_3f411486816b4c96a83fa6ffa4936942.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_8d086f0f72ce4207a8ac931214537e84.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_607fc7a298ef4a9283c959b699473899.pdf?index=true
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_f563f0d1b2284695832ae1d3760d6c12.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/wosig.pdf
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_f49e5e53e6b94994858adaefc50a7533.pdf?index=true
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_e92604b88fb54a5594d1ea5bad45b54f.pdf?index=true
    • https://s3.amazonaws.com/tubupejevomo/bengali_movie_online_free_2015.pdf
    • https://s3.amazonaws.com/lerezazo/dovasufiwe.pdf
    • https://s3.amazonaws.com/fejififimaketo/vunodum.pdf
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_ac9e8338e4e041f38101f4b81e4c80ce.pdf?index=true
    • https://s3.amazonaws.com/jukoxisojow/family_budget_software_free.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_off0000ef25.bin
f36cba7b1b784e26bb50b526381f92ca325d359f5fbc568b17718442f661af3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5400 bytes
font_01_sfnt_off0001016b.bin
641cc8ac4d43ff81f27ad8183504b10c6706387e21082cadc706c0664aab7e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10376 bytes

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