Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b31b92c98f1c88…

MALICIOUS

PDF

88.1 KB Created: 2021-05-16 00:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6d8c7039489627deeb613bf10608c8 SHA-1: e27cd817b2ad3ae69f0b6ca11d3f130aeeb0bbcb SHA-256: 32b31b92c98f1c88a44d543fdcf06db99b21b6ac37846689d529d6c238f16747
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary external URI pointing to 'resalured.ru', likely serving as a lure for malicious content. The document body, though heavily obfuscated, suggests an attempt to disguise the malicious intent by presenting as educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=context+clues+worksheets+with+answers+for+grade+7
    • http://br1.red/85756020977pyd3a.pdf
    • http://tofugezupeb.mygamesonline.org/53943066645.pdf
    • https://cdn.sqhk.co/fujalapevame/z1ij3gc/bowling_green_leigh_christmas_menu.pdf
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/73ff667f49377.pdf
    • http://kofupum.mygamesonline.org/bagazuvirojifavajuna.pdf
    • http://netopodimamo.mywebcommunity.org/rewepovagaxowa.pdf
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/5199445.pdf
    • http://mizarujil.mypressonline.com/gozusuwebonigifuzixup.pdf
    • https://cdn.sqhk.co/ditetona/TLcOowm/pitonatema.pdf
    • http://repair-foto.ru/sasiluvuvol09ij.pdf
    • http://instapriz365.online/conventional_agriculture_definitionp0k37.pdf
    • https://renenanap.weebly.com/uploads/1/3/4/6/134666424/c2252438c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gavexilatuvitaz/friend_in_me_sheet_music.pdf
    • https://s3.amazonaws.com/xofalepelala/cloud_9_meaning_weed.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_97d637cc23714aefa7905dc802b1106d.pdf?index=true
    • https://s3.amazonaws.com/xakusineba/tixisa.pdf
    • http://gutekuretejapoj.onlinewebshop.net/bsnl_stv_karnataka.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_2014aee0b1e34ae581815a61781b98a6.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_off00011642.bin
a2b8a11d0f4735cdcd2e977b7f796b01625cac5a2cb3e05912771985b7d54fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 5492 bytes
font_01_sfnt_off0001290b.bin
ad8f0e21b6a663a6af624a7a5218dd48a0a880071a76525e12861482bc1439ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 11828 bytes

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