Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c33198d95acdb2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 01:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cab09d5c14bab71a7a7fbf9c2026250b SHA-1: 9a9dedeb18d4f1633ee76c6bee73a74b442510a7 SHA-256: 20c33198d95acdb25cda55d4ad8ce02290f4d8004c248970eb0729ec86949b7e
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 link farms or potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=stay+hungry+stay+foolish+marathi+pdf+download
    • https://cdn.sqhk.co/ruvuwoki/Cjeid2u/47977473495.pdf
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/bosil.pdf
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/815428.pdf
    • https://cdn.sqhk.co/bomemenun/6Uhihhj/87743380460.pdf
    • https://cdn.sqhk.co/xupodafib/0ggKgiL/slither._io_mods_lag_free.pdf
    • https://cdn.sqhk.co/naliwanik/ztGghjC/vidokibadubelureguden.pdf
    • https://zefilezagomi.weebly.com/uploads/1/3/4/4/134474677/ae988e5f150.pdf
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/zobadik.pdf
    • https://mizovitima.weebly.com/uploads/1/3/4/2/134266674/manifisuguloz.pdf
    • https://gebekogekikak.weebly.com/uploads/1/3/4/6/134694855/wojivogadawexirod.pdf
    • https://tifidanubaliso.weebly.com/uploads/1/3/2/7/132740836/xutilakovotobipore.pdf
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/3dbe520dc8e33e.pdf
    • https://kuludiliwalu.weebly.com/uploads/1/3/4/4/134484861/b4e86ed.pdf
    • http://bazunujovi.scienceontheweb.net/trutech_under_cabinet_tv_dvd_combo.pdf
    • http://zosuwalerikare.getenjoyment.net/90254399125.pdf
    • https://cdn.sqhk.co/vizinifum/jiEiaij/fallout_shelter_dwellers_special_stats.pdf
    • http://kakolamilasaru.medianewsonline.com/78001001745.pdf
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/57519a.pdf
    • http://nomudepalak.medianewsonline.com/26133607935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/fosagoba/bokabit.pdf
    • https://s3.amazonaws.com/gopuze/how_to_adjust_my_vizio_screen.pdf
    • https://s3.amazonaws.com/widuxade/acer_aspire_v5-471p_touch_screen_replacement.pdf
    • https://s3.amazonaws.com/resixexi/haier_portable_air_conditioner_manual_hpb08xcm.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c2.bin
0b28d70fa9a0b5acac9ff245ecbcc6075311e7bfb202e27a24059953fae84f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 5752 bytes
font_01_sfnt_off0000ed4a.bin
604f18a79ab49f2fab38730bd52bfe52d4042b5cfa14e6c7c151c7357c0fbb5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10356 bytes
font_02_sfnt_off000110eb.bin
ebc10afebc15a73581062de09c2875f84cab2e8c3c1d839a59fe3cf02093508e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 5812 bytes

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