Malicious PDF — malware analysis report

Static analysis result for SHA-256 247b6a0c4b45abe6…

MALICIOUS

PDF

83.3 KB Created: 2021-04-29 00:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5488c27d257be276c7bd988fe7904cb6 SHA-1: e655faee7676c867d7c1c7724059a48de1e5b7ec SHA-256: 247b6a0c4b45abe6cf508f239bd94b54959f9c492d28928d4b66668888dc581b
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to lead users to malicious content. The PDF structure and embedded URLs suggest it is likely used as a lure, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=hmdx+splash+zone+speaker+manual
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60187df7e05dc.pdf
    • http://trysoda.pro/generate_responsive_email_templatepysbn.pdf
    • http://nojejolewowutes.22web.org/jobixivesitapumakido.pdf
    • http://pressit.space/computer_hardware_and_networking_in_tamilm06d8.pdf
    • https://cdn-cms.f-static.net/uploads/4385020/normal_601cdaa102275.pdf
    • http://purpless.vip/lazonulamoje1p46z.pdf
    • http://rasojupalipi.22web.org/pruebas_bioquimicas_bacterias.pdf
    • https://cdn-cms.f-static.net/uploads/4383302/normal_60321174b3f1d.pdf
    • http://fruitslope.online/62293706566tujn5.pdf
    • https://cdn-cms.f-static.net/uploads/4411490/normal_605caae03e72d.pdf
    • https://cdn-cms.f-static.net/uploads/4449973/normal_6031476d27b3a.pdf
    • http://cucoupon.info/ielts_reading_recent_actual_tests_2019_downloadloc8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vijiviwo.epizy.com/benerawepirazapijig.pdf
    • http://lojetewope.epizy.com/69700569844.pdf
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_543e452953a24bd8abab30a4fe30d8ad.pdf?index=true
    • https://s3.amazonaws.com/zupenafud/14999186631.pdf
    • http://talagolow.rf.gd/what_is_an_example_of_biological_psychology.pdf
    • http://weguxoxuwaxa.epizy.com/fleetwood_mac_dreams_guitar_tab.pdf
    • http://zumewozuzetarun.epizy.com/compound_words_worksheet_for_grade_8.pdf
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_155449c1976d495992c67a20b8a33cc8.pdf?index=true
    • https://s3.amazonaws.com/tipikaxe/20212212996.pdf
    • http://satuvet.epizy.com/40536992510.pdf
    • http://xuwuxubemepimox.rf.gd/change_the_world_v6_inuyasha.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_off000105dd.bin
d03dbb067db720f52e0649f990ae6e92f6a13e90bef5ff96d686665affc94eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 5340 bytes
font_01_sfnt_off000117e4.bin
7b2d42995ad4ae95d73311c197c73a7ec4d8cae73496a4afa37fddf39ea4999c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 12024 bytes

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