Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caf1f3996233589…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 13:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b867316a1eb17f51d69bc4adf22dd1bd SHA-1: 735dedb1610747c4309697976c0458d63701e19e SHA-256: 4caf1f3996233589d98c13c3cdfbbe3304705fba009709ede858f771d2e1ca8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on suspicious domains, indicating a link farm or phishing lure. ClamAV and ML heuristics confirm the malicious nature of the document, flagging it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=disney+%252B+roku+compatibility
    • http://lorakuze.sportsontheweb.net/how_to_add_text_in_blender_video_editing.pdf
    • http://afracheat4.xyz/how_to_write_lab_report_discussion9iwm2.pdf
    • http://reduslimitaly.website/tosisawukiguvire3zeyx.pdf
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/a184872a5d1.pdf
    • http://vumexovuvelafe.medianewsonline.com/tujuan_akreditasi_puskesmas.pdf
    • https://reguzuseja.weebly.com/uploads/1/3/2/6/132695615/budevudosigized.pdf
    • https://pizudakuputip.weebly.com/uploads/1/3/5/3/135347645/wadopesifigagi_bidamezizu_wivomij_bexepir.pdf
    • http://testrun.ru/lezovajoliweluwazulozyc1p.pdf
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/fidajeziv-wapuvawonilad-deliliduja-nivokedosu.pdf
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/rezoz-nakewojota-lojorokifuwum-rirugega.pdf
    • http://kezijumedet.mypressonline.com/romadorusidomeguvipeje.pdf
    • http://lojasamericanasbr.com/white_christmas_tree_with_clear_led_lightsuq3i3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/13712570669.pdf
    • https://s3.amazonaws.com/fosagobomap/mekidofosizesivijomudipi.pdf
    • https://s3.amazonaws.com/wifiduxezo/flashlight_piano_sheet_easy.pdf
    • https://s3.amazonaws.com/donake/97051063170.pdf
    • https://s3.amazonaws.com/borokegujuzero/1680085271.pdf
    • http://wujagenak.atwebpages.com/rainer_maria_rilke_book_of_hours_love_poems_to_god.pdf
    • https://s3.amazonaws.com/libusamagowuvo/kizivu.pdf
    • https://s3.amazonaws.com/fujadabez/gitlab_ci_yml_script_template.pdf
    • https://s3.amazonaws.com/bikikanafopavu/romagilumebep.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ae.bin
401a0176272b32b9d1e1e1a8772fe325299961636983b567bbc4effea3234df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5384 bytes
font_01_sfnt_off0000faf6.bin
9cd3b40e814907fa51e9ff934d44d0d2ca8590134efd0acd04a071664e079a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 10676 bytes

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