Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d18ff1331cc7aa…

MALICIOUS

PDF

65.8 KB Created: 2021-03-28 10:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df6dbbf0c1d9a9be5144c850dd996f7d SHA-1: 3254aa8cb3756ca2411b7aef35837b4679614052 SHA-256: e7d18ff1331cc7aa50faccb564fe3977e0871fa8076717827128d9ad20e42ef8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The document body and embedded URLs suggest a lure related to 'Naruto arena backgrounds' to direct users to external, potentially malicious, websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation of this file as part of a link farm or spam distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=naruto+arena+backgrounds
    • https://cdn.sqhk.co/fufigavaki/dvXvIOg/57402451511.pdf
    • http://zuxemesemubozo.mywebcommunity.org/sibiwa.pdf
    • https://cdn.sqhk.co/pevelefotuve/jjhbgeE/offroad_madness_hacked.pdf
    • https://cdn.sqhk.co/vugomupuzisa/ijhaN4A/48042062756.pdf
    • https://cdn.sqhk.co/gasubapo/mxOPheU/17511517085.pdf
    • http://vozujuluxe.iblogger.org/barbiturates_classification.pdf
    • http://giwapozolaleg.mypressonline.com/1_metro_cuantos_centimetros_son.pdf
    • http://rodajaxugeno.22web.org/32561726640.pdf
    • http://vovavipegum.getenjoyment.net/ortopedia_y_traumatologia.pdf
    • http://ruwaxidalemib.iblogger.org/7816372617.pdf
    • http://vigufut.iblogger.org/fewexiguvatuxinutibibetub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xetasif/79613490854.pdf
    • http://mizixizomafupez.epizy.com/javir.pdf
    • http://vudagolefedofa.epizy.com/dotera.pdf
    • http://miwufojo.epizy.com/vaxakabap.pdf
    • http://ziwufuv.rf.gd/sort_excel_spreadsheet_by_cell_colour.pdf
    • https://s3.amazonaws.com/sojuravewi/urdu_dictionary.pdf
    • http://tixaxit.epizy.com/dufenegudoxop.pdf
    • https://s3.amazonaws.com/kosipefojaw/60794562293.pdf
    • http://megunowibutik.rf.gd/convert_to_jpg_online_below_100_kb.pdf
    • http://kegigija.atwebpages.com/tarot_for_beginners.pdf
    • https://s3.amazonaws.com/xupimaral/joe_cocker_feelin_alright_piano_sheet_music.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_off0000c625.bin
54b4ebcde43afee2b5de760e5b11cdfdd1f4ff2d008299a3004aa82c989c7665		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 5248 bytes
font_01_sfnt_off0000d812.bin
bc9155712d5d127cfcddd242131eafc3da9e51411b2e97cf396b1511e8041dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 10096 bytes

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