Malicious PDF — malware analysis report

Static analysis result for SHA-256 a638a8f63c4f0c99…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 17:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdfc4fb5e54939800bed28f1fd4ebdee SHA-1: ceceb171f76048d620a16c245fd50387f72e0fa2 SHA-256: a638a8f63c4f0c993b7aedae0f5a09dc2022bbdc774ae0b41f3dc46ed59b2d5d
164 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 are dynamically generated, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/award?keyword=andorra+ski+map+pdf
    • https://cdn.sqhk.co/jozojijejip/QXgijbK/university_of_miami_football_roster_2019.pdf
    • https://cdn.sqhk.co/pozuwifofub/NIQhijj/mars_lander_rescue_mission.pdf
    • https://pozuzedik.weebly.com/uploads/1/3/4/6/134668333/0b21e4b.pdf
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/jixol-xirepavanakilib-retigexidaxebe-tobidufovuxe.pdf
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/6079309.pdf
    • https://fipupoluvov.weebly.com/uploads/1/3/0/7/130775710/c6e2ed94.pdf
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/samozu.pdf
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/julebe.pdf
    • https://cdn.sqhk.co/puvegipuros/hbjbgj2/old_love_songs_70s_80s_90s.pdf
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/rogeti.pdf
    • https://cdn.sqhk.co/bokirebi/iho3KVk/dinuxiwax.pdf
    • https://bezuwodasufex.weebly.com/uploads/1/3/2/6/132696249/7487347.pdf
    • http://sikirizev.22web.org/53659307806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e9c039e6dfd549dd9e8796433f4617ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7d6754a-c78a-47f4-8139-0b1964c54a51/degijibimiriruxan.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_81cb3d49076f4a7b8f0f9847a4bccc19.pdf?index=true
    • http://dekegafazuwad.rf.gd/beanshell_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/d72a2023-e693-467f-ab7d-7219a1d8348f/wahl_groomsman_rechargeable_trimmer_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0c37a27d-4345-42d7-88c3-4007b733ea52/libobaxutalonalu.pdf
    • https://uploads.strikinglycdn.com/files/2a5abe06-8008-484e-b4d0-1fa46f84f5f9/94187706952.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_d89ed0b9c9784f91a29e895180f6a390.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b551107c-3109-4a71-9975-460aac763f7c/lojidinavulobiguvuna.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_c3a2372ec9674e698120e20e890ad77e.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_off0000e4d0.bin
02130a7d6139a8431c23879f407b29f44eb0dc43a7bebd44015aebf682e7f519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 5208 bytes
font_01_sfnt_off0000f676.bin
bc2af9e37e85c96add12bce6fb2bfb7b28fbb5575b18490a003b180a949c7d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 12204 bytes

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