Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06a689bef07c3ce…

MALICIOUS

PDF

76.1 KB Created: 2021-02-27 20:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 58c750db41fd50f806a1f50f93caebfc SHA-1: 1e480611f7e855bd1281d161cf6c17ae9b7355cc SHA-256: a06a689bef07c3ce052ac422ea068ed09fa5f4dda48c183d9644dc00075859cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external malicious sites.

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://golowaki.ru/strik?utm_term=when+will+the+next+wings+of+fire+book+14+come+out PDF link annotation
    • http://vafotaxikijofol.iblogger.org/mopifamuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_600121f9eef62.pdfIn PDF document text
    • http://buzifun.22web.org/canada_online_visa_application_form_nigeria.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/2812106.pdfIn PDF document text
    • http://wiregabjuk.fun/zirozajoxozevajukivobqnsey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_601788aa6e6c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fdd8984204e1.pdfIn PDF document text
    • http://kelnoteres.xyz/custom_loader_in_android_githubmfv0d.pdfIn PDF document text
    • http://profapp.pro/how_to_change_cutting_blades_on_husqvarna_riding_mower1tjrk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gidibesuxi/kagegi.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/can_gta_5_run_on_ps5.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/crafting_guide_osrs_free_to_play.pdfIn PDF document text
    • http://sidogin.epizy.com/89070507969.pdfIn PDF document text
    • http://befokube.rf.gd/prince_lestat_and_the_realms_of_atlantis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 5484 bytes
SHA-256: 7c39016ac1a37ab595d5f4b81e7d8f41bbbef47eddc5556de21ff46c6ebb13e1
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10972 bytes
SHA-256: 7b989e1432789bd56d6c4ae18671a716234ab316c12aca00221459d9b6770666
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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