Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d5af747d10eeb4…

MALICIOUS

PDF

76.2 KB Created: 2021-05-09 10:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9c6eacb96da0f3d6c0b77c60a25b34 SHA-1: 7f5d95e8b1e952341fccd0bcce1b7bface51077c SHA-256: 24d5af747d10eeb4a1e87c6946f51500bab118f828b515d98a78ee3082e29222
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be generated content, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=writing+with+style+trimble+chapter+4+pdf
    • https://jasoveloxera.weebly.com/uploads/1/3/5/9/135967924/vaxodazopiwuzosiviwe.pdf
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/6a1e87e2a.pdf
    • http://mikovil.mywebcommunity.org/10882217250.pdf
    • https://cdn.sqhk.co/wevexifimur/jgNgeii/dragon_village_with_cheat.pdf
    • http://suporefebakibur.mygamesonline.org/dinike.pdf
    • https://cdn.sqhk.co/zamodozitip/eji07i6/running_shoes_nike_mens.pdf
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/wuroruvifosoda-negedimurowag.pdf
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/92456ae.pdf
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/fb94cb.pdf
    • https://tigekinoninufuv.weebly.com/uploads/1/3/4/6/134687643/de25126ba.pdf
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/5533325.pdf
    • https://xavozunop.weebly.com/uploads/1/3/4/3/134305705/pipatetipa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zejibanunepi.myartsonline.com/74052861776.pdf
    • https://s3.amazonaws.com/setaxilitozuko/32721334444.pdf
    • https://s3.amazonaws.com/roxawo/dbx_286s_preamp_processor.pdf
    • https://uploads.strikinglycdn.com/files/21e7e96a-3bff-4bd4-b1f2-0e7a82524f65/79174764303.pdf
    • https://uploads.strikinglycdn.com/files/6e5da5c4-4be9-40bb-b11f-26e952a99587/bafutokewiwefe.pdf
    • http://robefowoved.onlinewebshop.net/relative_clauses_exercises_intermediate_level.pdf
    • https://uploads.strikinglycdn.com/files/89b73283-3e95-4df3-9fe1-a0430049c0b1/installing_diono_radian_forward_facing_with_seat_belt.pdf
    • https://uploads.strikinglycdn.com/files/e94583e1-c161-40cc-9a3d-7daa4023a542/gizot.pdf
    • https://s3.amazonaws.com/pobixedele/bluestacks_free_windows_8.pdf
    • https://s3.amazonaws.com/nutanigonu/dnd_5e_monk_leveling_guide.pdf
    • https://uploads.strikinglycdn.com/files/3a8f04cb-0adf-48d1-9242-4615629cae01/gugakevazawodet.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_off0000e8e5.bin
b974a1656bde0e56f8e185c991045cc59d564d3fd0e37fc1f6d171952763bc9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 6004 bytes
font_01_sfnt_off0000fd58.bin
5b3aaf7c3141961252197658b599dcbdb87bd61d831445296d87a096252443cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 11228 bytes

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