Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a1286d1c72f341…

MALICIOUS

PDF

75.7 KB Created: 2021-05-09 01:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daa9eeb9aed4952a911b1395a4f963fe SHA-1: c0faf8fd8eb6241d0bbb3bfe23fb14813d9638cc SHA-256: d7a1286d1c72f3418e6395df08654f9eac05925108d192ec8c9a3ea020c6c336
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of the 'utm_term' parameter in one of the URLs indicates a tracking mechanism often used in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9133

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
  • 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
  • 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=world+of+darkness+innocents+pdf+free
    • https://rekilobuviren.weebly.com/uploads/1/3/1/3/131380299/7419446.pdf
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/0908964a.pdf
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/1735151.pdf
    • http://vapufizap.iblogger.org/84667262491.pdf
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/54387191a5.pdf
    • http://dowedunazab.iblogger.org/75628755971.pdf
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5ffa7149da0dd.pdf
    • https://diborukokaw.weebly.com/uploads/1/3/0/8/130814192/1412602.pdf
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/7f33367.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5fe7102f84b1f.pdf
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/bd1fb2bee.pdf
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/6346463.pdf
    • http://xanuxif.22web.org/22071079098.pdf
    • https://fegopamaxu.weebly.com/uploads/1/3/4/8/134896151/dalidakuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e920adcc-7adc-420f-9d20-7d04dddf3215/82514291862.pdf
    • https://uploads.strikinglycdn.com/files/9163ae66-4608-403b-9568-ced50bf4c7b3/vodexojuxem.pdf
    • http://kususen.myartsonline.com/conduction_of_heat_in_solids_carslaw_download.pdf
    • http://tuxabatadifu.onlinewebshop.net/public_park_design_landscape_architecture.pdf
    • https://uploads.strikinglycdn.com/files/2227cf1c-c709-4574-99f4-3c338eeda7cf/rozumaroladaguluxalixuvaj.pdf
    • http://felixoxajaxev.epizy.com/58655252228.pdf
    • http://posikin.myartsonline.com/52853593081.pdf
    • http://xeziribosivamis.epizy.com/20341652340.pdf
    • https://uploads.strikinglycdn.com/files/22694623-cdae-4a54-bacb-536290d8a6b1/how_to_fix_a_washing_machine_that_is_off_balance.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020c.bin
a4e86b13670f3006a1faea403edd715e9731b67581e673b19c7b11c7a8fff148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 5224 bytes

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