Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda424b52d45fb2e…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 13:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9e0e617caec239693887f10205a3980 SHA-1: 79a5438682a075f7af1c9ccf9a5e06c8bdb74a37 SHA-256: eda424b52d45fb2efa6a3ddfd6a268520da2a929e6799acf379317ae4c3f10cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm for SEO manipulation or phishing. One prominent URL, 'https://jacksth.ru/strik?utm_term=how+many+minutes+per+pound+do+you+cook+a+turkey+in+an+oil+less+fryer', appears to be a lure disguised as a search result. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+many+minutes+per+pound+do+you+cook+a+turkey+in+an+oil+less+fryer
    • http://xajaweronasuxo.22web.org/47371706748.pdf
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60354ce97175d.pdf
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/lusavemum.pdf
    • https://cdn-cms.f-static.net/uploads/4424026/normal_602f4f950ba44.pdf
    • https://cdn-cms.f-static.net/uploads/4374980/normal_602ba4f0ee0f9.pdf
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/265cfd7188.pdf
    • https://cdn-cms.f-static.net/uploads/4443608/normal_60558ac79919a.pdf
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/8926917.pdf
    • http://zebinoleruf.iblogger.org/aw139_rotorcraft_flight_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4412773/normal_60247bec8e08c.pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_600efb1fc40d0.pdf
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/tidunisidesuvuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_24a3a6ac1d7e427489e0d09a1421ee61.pdf?index=true
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_62780f2f0c2d42e28f1009482c0e9b2d.pdf?index=true
    • http://fipotunisobojow.epizy.com/origins_the_journey_of_humankind_episode_2.pdf
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_a6b016bd088a4a56b5a980ab7a15bf07.pdf?index=true
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_af283ea1abe844a395f4582701b4c61a.pdf?index=true
    • http://dibulazovila.rf.gd/nevizulawurakov.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_46e3ba4d79584a79b0174b7db54acbaf.pdf?index=true
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_0ec7555caa774efb82e162dd23370bff.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_off0000fa1e.bin
acc559c5f5d8beff96f01f142f105860fd12e8fb991a3a94b855e7a9d7260120		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 5520 bytes
font_01_sfnt_off00010ce1.bin
02be54b9bee896b2b02e36948339a3ad8d1f190b5f634dea11fba7338141a479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 11200 bytes

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