Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b73d81caed1bd6…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 10:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223e769f52f0082016adb0214efdaee5 SHA-1: 25f8486e59ecef194170e31992d732aa860292a6 SHA-256: b7b73d81caed1bd61fcef5b5c50fa3df1a26608e3e6aff039831c88514c1d5a4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs, such as https://ponafet.ru/strik, are the primary indicators of malicious activity.

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://ponafet.ru/strik?utm_term=pride+and+prejudice+2005+mr+bennet+quotes
    • http://budokudepa.scienceontheweb.net/what_are_some_interesting_facts_about_ancient_greece.pdf
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/3951871.pdf
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/ffecdb213e3d14b.pdf
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/sixujinewu.pdf
    • http://pixidilivutep.medianewsonline.com/luvaxuleranemikemibu.pdf
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/mabegoberofezemud.pdf
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/4409544.pdf
    • https://wanujonoguj.weebly.com/uploads/1/3/1/6/131607110/xaredabisosal-rujezowe.pdf
    • http://vijepuwobewi.mygamesonline.org/thakur_prasad_calendar_november_2020.pdf
    • http://wowovamofuzo.sportsontheweb.net/business_writing_for_dummies_natalie_canavor.pdf
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/zobetel.pdf
    • http://wamuwosola.mygamesonline.org/carol_of_the_bells_sheet_music.pdf
    • http://fidumanodabimor.22web.org/esclerosis_multiple_tipos.pdf
    • http://goxamid.mypressonline.com/41468154361.pdf
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/212e69bc73a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_99ff2ed68ffb4e9e920e58c2b9c6e33b.pdf?index=true
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_fb647ab0c0664b91972af8fdd71b3ce1.pdf?index=true
    • http://fopupasefe.rf.gd/inception_time_sheet_music_trumpet.pdf
    • http://latowetutut.epizy.com/commando_2_movie_720p_filmywap.pdf
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_f5ee8a70bd9d420a9788a3336a109502.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_off0000ec58.bin
a2f324e4cc71b23a40e27f4c59e982b80c9239982887390b5900b176db0ee67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 5928 bytes
font_01_sfnt_off0001006a.bin
6eb3d0d4671c2cf9279f3baf349ee5d52058256741f7d0e940866d082f7efee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 10620 bytes

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