Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdbe8e721f8fbd0…

MALICIOUS

PDF

73.8 KB Created: 2021-05-11 18:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 10e7732180f738ac9c2b99778b6661fb SHA-1: 52859aac3b520e9e8e53a4fb51054a3cc166ff07 SHA-256: ecdbe8e721f8fbd0b396d08dbae67cf50fc45c6945adb64ee6a19a9f260de086
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 critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a search query as a UTM parameter, suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=what+does+maintenance+required+light+mean+on+toyota+avalon PDF link annotation
    • http://top-agent.ru/mokamemisisipl0t54.pdfIn PDF document text
    • http://nimolebefiv.22web.org/anne_frank_powerpoint_ks1.pdfIn PDF document text
    • http://irisca.online/vikodirenewuwofejilakerex8xm8x.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/LggjAmt/890273781.pdfIn PDF document text
    • http://limebago.iblogger.org/62428427135.pdfIn PDF document text
    • http://sovetnik53.ru/what_does_a_vegetarian_bodybuilder_eatpe3z4.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/Ijajgii/inkjet_waterslide_decal_paper_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/i9G3ljj/ice_cream_places_open_on_thanksgiving.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_bccdc44749c64c448108e8e67959718f.pdf?index=trueIn PDF document text
    • http://jigosip.epizy.com/peavey_bandit_112_transtube_series.pdfIn PDF document text
    • http://fefadipif.rf.gd/sazatamepelik.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/homelite_xl_chainsaw_idle_adjustment.pdfIn PDF document text
    • http://dojisurufam.rf.gd/gutuxalafe.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/93801308713.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/talosesuniwo.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_aac5a38e2e5e4385a73acdcba5161662.pdf?index=trueIn PDF document text
    • http://buvekopap.epizy.com/vlc_smart_tv_lg.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/4_elements_of_film.pdfIn PDF document text
    • http://linewezidewixa.rf.gd/tenancy_agreement_template_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/13056453125.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 5656 bytes
SHA-256: d58fd14e793c32c4b616dba7a9878adab61fd4e622fe574479d2aa8ed6e9bbe1
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10260 bytes
SHA-256: 9423b8b65ff71ede4eb4b8945173e3aa8c591f439bd73133fbd1de23c6d11197

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