Malicious PDF — malware analysis report

Static analysis result for SHA-256 98aab5b4c3c7075d…

MALICIOUS

PDF

83.4 KB Created: 2021-02-18 22:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8481fece109324c4a5959db1ac77790b SHA-1: 261612146a39679a55138ffe68cddb075c5d016a SHA-256: 98aab5b4c3c7075d8bcd8a2f6180594147d6cb96cd07731a4525815deb34203b
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs suggest an attempt to lure users into clicking through to potentially harmful content.

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://seumenha.ru/123?utm_term=in+the+heart+of+the+sea+nathaniel+philbrick+summary PDF link annotation
    • https://cdn.sqhk.co/jututumogu/iagjd9t/iphone_11_wallpaper_hd_4k_anime.pdfIn PDF document text
    • http://workmonster.net/82037751985fz2u7.pdfIn PDF document text
    • http://hookup666.site/97266732657y1mh.pdfIn PDF document text
    • http://foodguideblog.com/c_diff_infection_guidelinesdw4w5.pdfIn PDF document text
    • http://manthoughtswebsite.website/tivo_series_2_lifetime_subscriptionknclx.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/afgh0ie/62454900932.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/ZWTBigi/33440710101.pdfIn PDF document text
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/wiwoxu_zikabupu.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/b0252.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/daranejozitawoxesetu.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/mufatonasarawuse.pdfIn PDF document text
    • http://fortuneocredit.com/vpn_for_pc_free_filehippo2psez.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/kulawamu.pdfIn PDF document text
    • http://hh666o.site/fake_blood_cancer_report_downloadqiagr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/astronomy_science_book.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/zotatajesa.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/cheppave_chirugali_songs_mahesh_babu.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/53183756095.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/6347709069.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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 5500 bytes
SHA-256: 9faea58d141269451c82134bf978a5b90b151d9b00f6d281919e3d29c338d7da
font_01_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11052 bytes
SHA-256: 00d521983ceabe876a98660846907ab12062be564eea7198a52ec5e8da5309f5

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