Malicious PDF — malware analysis report

Static analysis result for SHA-256 76266b655437770e…

MALICIOUS

PDF

86.7 KB Created: 2021-02-28 08:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9fd5c489041b30cbf791487212fb7204 SHA-1: 486e77bc77d3d718cdb6da6509b3ef745f20658d SHA-256: 76266b655437770ef149e79a34bb2721825a330cbbd1738a23518535cbfe0e0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely intended to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/aws?utm_term=civilization+and+its+discontents+sigmund+freud+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387826/normal_602f5fb3cb753.pdfIn PDF document text
    • http://jepunigotamub.iblogger.org/how_to_reset_a_petsafe_wireless_fence.pdfIn PDF document text
    • http://criticcxck.space/braun_series_7_model_790cc-71ixiw.pdfIn PDF document text
    • http://skout.tech/sqlite_android_studio_pluginahr2v.pdfIn PDF document text
    • http://polfact.site/how_to_work_out_net_profit_income_statementgldn4.pdfIn PDF document text
    • http://pushbiz.fun/pajimoxuzejokesw273.pdfIn PDF document text
    • http://eurozone.pro/33653498408kmmbo.pdfIn PDF document text
    • http://lg-copyright.com/ffxi_whm_solo_leveling_guide9jet0.pdfIn PDF document text
    • http://sexedate69.site/xedefujogafozuromobemib9brk.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://jobagivojik.rf.gd/domizorobenenukesikiwejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/what_kind_of_battery_does_a_samsung_soundbar_remote_take.pdfIn PDF document text
    • http://dufofukitali.rf.gd/samsung_galaxy_tab_2_7.0_gt_p3113_battery_replacement.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/twilight_breaking_dawn_part_2_soundtrack_cd.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_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 5456 bytes
SHA-256: ea3bbb279446670db79e37eb7da16a1fcd266a383867a0d658e744c22ab1fa1b
font_01_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 10316 bytes
SHA-256: 694bd82feb9fc1ca16fce3fb772341629ef1e079fb9c0fb6042a543beda950ee
font_02_sfnt_off00013f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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