Malicious PDF — malware analysis report

Static analysis result for SHA-256 6392523711539491…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 01:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ee60431444fe963696b2eb6ecd3c36 SHA-1: 2c2033a40ab56357ad594bd0e2461025753b32ef SHA-256: 639252371153949172661a390bc63f91c214be3a87a5017eb02ac64f76a6c6da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, indicating a link farm or phishing attempt. The primary malicious URL identified is https://nipisod.ru/123. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=where+are+you+from+in+german+formal
    • https://lesaletalakiwop.weebly.com/uploads/1/3/1/3/131379456/dorufufuwarakamu.pdf
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/4019365.pdf
    • https://cdn.sqhk.co/libuzewis/jianRCb/skype_7._40_for_windows_8.pdf
    • http://ritikutoxukor.22web.org/gabitopawaririzuzawefub.pdf
    • https://cdn.sqhk.co/zukuxenopo/kOlGpid/93671111612.pdf
    • https://cdn.sqhk.co/purorenutuw/pighgie/lekesipovukifufexu.pdf
    • http://loxupuf.mygamesonline.org/147888457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruvaseravijuged.rf.gd/akbar_anthony_video_song.pdf
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_8e450e5dc5284b639e6ced5f0174d831.pdf?index=true
    • https://s3.amazonaws.com/gebukil/neato_botvac_connected_replacement_parts.pdf
    • http://fataragoreb.myartsonline.com/are_410_gears_good.pdf
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_f149b3b1b2a5482db79a6398afc66a15.pdf?index=true
    • https://s3.amazonaws.com/degisapemifa/22352691038.pdf
    • https://s3.amazonaws.com/liguwubore/42947810981.pdf
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_46d79f4f41624706b88be68e2e8617b8.pdf?index=true
    • https://s3.amazonaws.com/feborobegibew/fikozaxoposogegududedup.pdf
    • http://xirifoxoxoxuxi.rf.gd/carcassonne_big_box_2020_rules.pdf
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_8d58c8a374454e7d9d6a8006fdb696d8.pdf?index=true
    • http://delozaroj.epizy.com/fujunufileb.pdf
    • https://s3.amazonaws.com/fewunadupop/btc_marksheet_photo.pdf
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_80ffe450c5d4417c8dff998a02a7337b.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_off0000f263.bin
1eb6a5254e9b3fa9c8d28008bac2c7c8cccbec5041881e658290a6c30ff29527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5120 bytes
font_01_sfnt_off000103bd.bin
e37dce3bc1e67155dc26473c5ae7bc2f329eec3114b4b63cefc78e3a2146e765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 11384 bytes

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