Malicious PDF — malware analysis report

Static analysis result for SHA-256 6175759827b69690…

MALICIOUS

PDF

84.5 KB Created: 2021-03-04 23:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fbe42ddb757605bdcb5ed6b375cc30c SHA-1: bb034458052c0b64d15d74d716384a18ec1d7cef SHA-256: 6175759827b696906d5b513693af9305a47134e193092ce1b9165ecf72b7bf61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious 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://resalured.ru/wix?keyword=middle+school+science+praxis+study+guide
    • https://cdn.sqhk.co/letinumi/b5Mgijj/wozek.pdf
    • https://cdn.sqhk.co/xoberuweri/MhfjgMF/radio_city_box_office_phone_number.pdf
    • https://cdn.sqhk.co/vibisidumes/8Th3jeO/ritebixugovup.pdf
    • http://momarivido.mypressonline.com/why_foodsaver_not_sealing.pdf
    • http://xusugiponag.22web.org/71457603122.pdf
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fedc59d4faad.pdf
    • https://cdn.sqhk.co/pufowuvikij/Nkhhhgg/parkour_race_freerun_game_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/pazakazagoz/fSgdQhf/scentbird_new_york_ny.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_602e2d7a6c32a.pdf
    • https://cdn.sqhk.co/mawejoxejobe/iieyD7L/14134299225.pdf
    • https://static.s123-cdn-static.com/uploads/4390329/normal_6005b02314115.pdf
    • http://wipunemobak.mygamesonline.org/how_common_is_obesity_in_australia.pdf
    • https://cdn.sqhk.co/keridola/xgh8Eib/xalufuvibutazexunew.pdf
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fca5e11419c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_a56a963d693e418c96f2c955e0ad5a38.pdf?index=true
    • http://tazuwaxerufuje.epizy.com/beats_by_dr_dre_monster_manual.pdf
    • http://gafodix.myartsonline.com/xinisojusakomagotolugo.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_70f7d4070ea146ccb2eabfeb20bbe3e6.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0403a5471fde4611969bd9fb4ae6bfd0.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_off00010d85.bin
e2dba162ee7c595845003b35622dba923bb4615d82d288b2f8b7368b6a2d93c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 5508 bytes
font_01_sfnt_off00012058.bin
d8a2cb24f5bfd0961218057d25352bdfa9f8f6961b43d6eefcd8a72827205253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 10688 bytes

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