Malicious PDF — malware analysis report

Static analysis result for SHA-256 7227259527407a03…

MALICIOUS

PDF

71.7 KB Created: 2021-03-08 21:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c678984ba43e0fe29a093f4b52181d SHA-1: 47bc44ad98057b0d2fab4d5b22b9c5129366d487 SHA-256: 7227259527407a03cefa857d1f0f8fdc2920b3d29e1208bc956db62e49787e5a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or phishing campaign, aiming to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to exploit users through deceptive 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://nipisod.ru/123?utm_term=bartender+software+new+version+free
    • http://tanijijud.sportsontheweb.net/side_effects_thyroid_hormone_replacement.pdf
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/2832966.pdf
    • https://cdn.sqhk.co/kosozezoxuxe/hcQidgd/37592730991.pdf
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/7263071.pdf
    • https://beponuju.weebly.com/uploads/1/3/4/6/134626977/7133177.pdf
    • http://gagimubu.mywebcommunity.org/4520591002.pdf
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/kotazirowa.pdf
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/2b7ec7943.pdf
    • https://cdn.sqhk.co/govulasem/htgfhix/bowiwanevotifuzejofi.pdf
    • http://memiwuv.mygamesonline.org/yoga_poses_to_help_with_constipation_when_pregnant.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sumidemeg.epizy.com/motion_background_for_powerpoint_free.pdf
    • http://nasutewu.epizy.com/ffmpeg_programming_guide.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_a46f6624d3ed4157ac83e9c3c62924ab.pdf?index=true
    • http://lipepojofutuxuf.epizy.com/dilifiwozo.pdf
    • https://s3.amazonaws.com/bivanud/vixutetewinasakitopewokor.pdf
    • http://vifidumefitur.atwebpages.com/how_to_reset_sears_washing_machine.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_e5f97224dc04487a9a62b13762782714.pdf?index=true
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_7fc1624aab1645c09d094cab2690ac9d.pdf?index=true
    • https://s3.amazonaws.com/rotowan/fssai_answer_key_check.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_36014c63fee04ee6bf9d1728de0a09ab.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_off0000dc43.bin
64cd092601be73c1282bdc07dcd3ad26c5d4e8af18a674af49959fd82c53d960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 5068 bytes
font_01_sfnt_off0000edac.bin
3d5d27854a7c432116449c8c6d2f8869c589a71e36136efe9601caf749a54e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 10516 bytes

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