Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c813550da136f0…

MALICIOUS

PDF

92.2 KB Created: 2021-04-06 04:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eef67b85ca314d8bd9d5f4d588a8a2c SHA-1: 7bb8955a4037ab1fecc22f7e9a3101f975351a2b SHA-256: a5c813550da136f06ec450fd69cf09bf2e7520ca3eab9dafe343be1cec7d7312
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=howl%2527s+moving+castle+english+voice+cast
    • https://cdn-cms.f-static.net/uploads/4414848/normal_60651bb4bda27.pdf
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/de7f7.pdf
    • https://cdn-cms.f-static.net/uploads/4417025/normal_6048e58351305.pdf
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/783a1927ec.pdf
    • https://cdn-cms.f-static.net/uploads/4417834/normal_601d5cb7d295c.pdf
    • https://cdn.sqhk.co/newupulig/tdXjdjc/turkey_hokey_pokey_youtube.pdf
    • https://cdn.sqhk.co/zokuwagopole/rYjhrjf/forsaken_world_gods_and_demons_mobile.pdf
    • https://cdn.sqhk.co/denugesugumu/OJCXgfv/kigulix.pdf
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/5051942.pdf
    • https://sewigemebovoneb.weebly.com/uploads/1/3/3/9/133997870/rijorakenetu.pdf
    • https://cdn-cms.f-static.net/uploads/4375356/normal_600a54e2921cc.pdf
    • https://cdn-cms.f-static.net/uploads/4491152/normal_60550eb68283e.pdf
    • https://static.s123-cdn-static.com/uploads/4467589/normal_5fcccc4fe795a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_8c25055cec6b42d09fec2b770e6b4243.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f856ec2f-4599-4390-bea8-a4148089d97b/the_survival_game_2020_release_date.pdf
    • https://uploads.strikinglycdn.com/files/517a5425-d736-4c7e-a2e7-4410a0dc8a20/love_chunibyo__other_delusions_ending.pdf
    • https://uploads.strikinglycdn.com/files/6e498ed4-d016-43f3-b326-c74d1aae7dc2/who_won_the_brandenburg_vs_ohio_case.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_4d45044fa58544889bbdca9e84d3f8f1.pdf?index=true
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_6b5eab00732049cc8e8ef327546cbdf2.pdf?index=true
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_c2d297a6cadd4edba2b88de07e444eaa.pdf?index=true
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_6fb0360189a048eba71ecbcb3bcfbe2e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010518.bin
68eb15ace9adbf915eba01ed64e5567602bea7266a92d07404ea35dcd02b0ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 4508 bytes
font_01_sfnt_off000114ff.bin
47f1b0c1ad6cdd355ec4c5ed00fbd8954680626e063bc0b7c201d6d156715fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 5264 bytes
font_02_sfnt_off000126e1.bin
f10b5732f808c57aea0eaae7604b3b42948ab1f89aac031e2f0a064041819b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 11824 bytes
font_03_sfnt_off00014dc7.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC7 16092 bytes

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