Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8a5b8699f07732…

MALICIOUS

PDF

100.8 KB Created: 2021-04-22 09:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44c4ea66a2042d9e857037c350385767 SHA-1: 4b318cd276ee98bb1b7ea96c8e2e97317a6be5fd SHA-256: 8f8a5b8699f0773279aefcf4b966a838d6f9918fd426f704784e7fcfefe4e9f1
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to essay writing. The presence of external URIs indicates an attempt to redirect the user to a potentially malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=how+to+write+and+structure+an+essay
    • https://cdn.sqhk.co/vugasoveg/jgchfBW/15996798962.pdf
    • https://cdn.sqhk.co/bubarozotuj/fcgjhi2/vumew.pdf
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5fe8f19c2e8e9.pdf
    • http://ighelpcenter.xyz/filter_lightroom_androido732r.pdf
    • http://yourbigdick.space/47762835852d5sg5.pdf
    • http://cadenalia.com/mallampalli_weather_reportmw8rb.pdf
    • https://cdn.sqhk.co/tivinarafuvu/figjiIg/fuwakolobapuvimob.pdf
    • https://static.s123-cdn-static.com/uploads/4385014/normal_6008347a72c2f.pdf
    • https://cdn.sqhk.co/verexoleki/ibghWqe/5358601455.pdf
    • http://dmgameplan.com/83627004198iqcyp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/45e4e519-5cfe-457d-b792-0945ca2bcff9/how_to_flash_t1-11_siding.pdf
    • https://s3.amazonaws.com/folexapurilowe/55756188232.pdf
    • https://uploads.strikinglycdn.com/files/23bd8e62-6e98-4e6c-a7cd-9d108077c541/25656038914.pdf
    • https://uploads.strikinglycdn.com/files/4e336475-49df-4f14-acaf-ff052bb5f6b4/best_hotel_booking_sites_in_india.pdf
    • https://s3.amazonaws.com/vikukinumet/77507259795.pdf
    • https://uploads.strikinglycdn.com/files/db6d26ec-e8ba-42e2-8b94-3e8fdf18ba8d/monsterverse_movies_in_order.pdf
    • https://s3.amazonaws.com/wixatax/24372088448.pdf
    • https://s3.amazonaws.com/jotogorurekuro/bhagam_bhag_full_movie_mp4moviez.pdf
    • https://s3.amazonaws.com/genijusemu/tread_plate_aluminium_sheets.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_off0001421b.bin
f04aaae9bf31ebb5ed7afc0d9c7abc0da17e8c247c641e5dbe97384f3726ff1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 4940 bytes
font_01_sfnt_off000152fc.bin
3a47c28f40d0f70b73e617f36c2b76060331f8ea2f8d108875a98f91cbe53757
pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 10720 bytes
font_02_sfnt_off0001777a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1777A 4324 bytes