Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9619a96cb9cec8…

MALICIOUS

PDF

77.4 KB Created: 2021-05-03 22:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b231be50e315e89db16ad0ee0000df6b SHA-1: bb5f6df9117cceba504d41d2911add3954cbb56b SHA-256: fe9619a96cb9cec8561ac49f8c1999cb9415b3b92f463e98dca571297212b400
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The presence of multiple unknown reputation URLs suggests these links are likely used for malicious purposes such as phishing or distributing further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=brinkmann+smoke+n+grill+price
    • http://sevoxotedeki.medianewsonline.com/ashrae_fundamentals_handbook_2009_free.pdf
    • http://sugalomiwuto.getenjoyment.net/pdf_to_word_ocr_converter_free_software.pdf
    • http://rm-swis-mine.com/6467375323638pwx.pdf
    • http://xonitaj.mywebcommunity.org/96490514952.pdf
    • http://top-salez.site/2264717810626y4q.pdf
    • http://guwaxata.iblogger.org/22006722777.pdf
    • http://zutatowatipo.mywebcommunity.org/96538394728.pdf
    • http://sovuxofi.66ghz.com/22099515665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bufipevuril/airline_industry_history.pdf
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_8d21ab0fa0f14b4e9d48c5156ac16d75.pdf?index=true
    • https://s3.amazonaws.com/libusamagowuvo/95451592268.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_67f5343c017248b2aaa63fde4f42a839.pdf?index=true
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_8b352f9909c344be9640f412b2fd9609.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_124c8332588c42eda81a49e19f4555f7.pdf?index=true
    • https://s3.amazonaws.com/simujix/comment_apparaitre_hors_ligne_sur_whatsapp_android.pdf
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_e3d7d398d06b4abab00740ae3606f3dc.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_f452b8c63401466a8ee3176240ef20da.pdf?index=true
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_134fa5dde9b54970bea6b99a55d0031b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57f.bin
0dcdeb3d738d5362190ae9e9c812c4f982bc56dcc0a8da0f4dd6ea17c2758ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 2872 bytes
font_01_sfnt_off0000efd1.bin
6b9a50bc75a11ed4acaae0f971fac64fec4bd42e6813954c017f34ccee57e5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5364 bytes
font_02_sfnt_off00010200.bin
64292a8c4dc0b306b14ea160dc28a1f480f0d62340919236970c6087edf50101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 11320 bytes

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