Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1cf8d1add65449…

MALICIOUS

PDF

89.4 KB Created: 2021-02-27 23:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 64a2e26a452442ac9dd69aeaa8c4e5ce SHA-1: 148dc2017700fd819411a02af94977bde268591a SHA-256: ea1cf8d1add65449154bd6cc596684b705ba286301cf6c0be1b247b4a359769c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggests it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://ponafet.ru/wix?keyword=the+great+barrier+reef+readworks+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388405/normal_60236fcc7999e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_60033e4737f68.pdfIn PDF document text
    • http://findonelove.online/98943183955j7gyo.pdfIn PDF document text
    • http://opit.space/cho_sun_ok_restaurant_menub4lus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_5fdb0ca999186.pdfIn PDF document text
    • http://immorta-cross1.club/mega_boy_ponte_novaav99y.pdfIn PDF document text
    • http://benosetib.iblogger.org/garisigiterikur.pdfIn PDF document text
    • http://idealslimitaly.site/40554232069opzl0.pdfIn PDF document text
    • http://rumagadoli.22web.org/jifuzufaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_602240ff263c1.pdfIn PDF document text
    • http://sunshop.pro/clue_scroll_hard_maps_runescapeit3w4.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://wumuduwowuwi.rf.gd/avatar_the_last_airbender_comics_the_search.pdfIn PDF document text
    • http://meferujapepaz.epizy.com/writing_contests_2020_no_entry_fee.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/49658007132.pdfIn PDF document text
    • http://sobezoneroli.epizy.com/momutunumetefobaw.pdfIn PDF document text
    • http://zarilapaserit.rf.gd/worakuzajowigafololubafa.pdfIn PDF document text
    • http://zozafiromilofin.epizy.com/musixagoragigel.pdfIn PDF document text
    • http://nazedizabif.rf.gd/railway_reservation_form_online.pdfIn PDF document text
    • http://lidikulogape.rf.gd/54113117567.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_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 5172 bytes
SHA-256: 881ce10a93aa27e9fa05b85aa8b110eed82b695ed1e62317f9d33e5ea7d64a61
font_01_sfnt_off0001249b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 10964 bytes
SHA-256: dd974c77d227a567a2770858aecf37841402bf17d7c9b33b58728a82ba4c433d
font_02_sfnt_off000149e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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