Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f542d2b6fd19641…

MALICIOUS

PDF

97.7 KB Created: 2021-04-01 19:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 559557dca2cbf0843a83ad46ae8c54c5 SHA-1: b30fa0d00adbdc39abafa46bf7e1f4e06af6194e SHA-256: 1f542d2b6fd196413df28818d476a36277a24b6e40b13f5ca155cee31f3a3e30
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wix?keyword=personality+reflection+worksheet+answers PDF link annotation
    • http://eliyalte.com/guramakilasudolepativewabrqzb7.pdfIn PDF document text
    • http://dmgameplan.com/after_deschooling_whatypg4c.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/13004016093.pdfIn PDF document text
    • http://koprovk.xyz/dell_optiplex_9010_all_in_one_i5_pricebk3pz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_604d62154b8d7.pdfIn PDF document text
    • http://tranquils.space/dediwubanuwupamemebazupopag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_5fd251fc20573.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/old_public_administration_vs._new_public_management.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5ff64c478eeaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_600927fecfbf3.pdfIn PDF document text
    • http://esclick.pro/mogikatobisozq8g2.pdfIn PDF document text
    • http://tohld.in/full_blood_count_sample_reportzfv4j.pdfIn PDF document text
    • http://repochka.site/fupefedofumj8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fd0b7ded0a2b.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/panchatantra_stories.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/45889740735uiota.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
    • http://faxiruvud.myartsonline.com/lead_like_jesus_ken_blanchard.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/16629179494.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/marine_archaeology_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/how_to_scan_a_document_with_samsung_scx-4623f.pdfIn PDF document text
    • http://domuromu.atwebpages.com/meximozexubofuxagodor.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/vobirirowexugitozozikon.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_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 5016 bytes
SHA-256: de4072826d4670bb7bf238f2c1d29b8d00338802edb88d715e33f6527b2fe7b9
font_01_sfnt_off00014515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14515 11188 bytes
SHA-256: 2fb32b3031c3168866ae51c13c4da88f87b9231ccf8b9b8fde1d30cc9ada4a9d
font_02_sfnt_off00016afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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