Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef16886818ae2592…

MALICIOUS

PDF

92.5 KB Created: 2021-03-23 05:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cccb3f319db0d99d709ee860888133bf SHA-1: 50f467c3f5c9a23a132c2ffbec807cec84b1c435 SHA-256: ef16886818ae2592a71048ba6021da139efc7ff926d2a3eb6e599c1fb9686269
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to host phishing pages or malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/aws?utm_term=novation+impulse+49+review
    • https://cdn.sqhk.co/pawijilabu/iihjNUC/linizilozejumiwijo.pdf
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd63d46deb37.pdf
    • http://tranquils.space/low_cost_flights_to_las_vegas3lgk1.pdf
    • http://pukebebizadolu.mypressonline.com/chapter_8_review_chemistry_answers.pdf
    • http://creditreportus.info/dogiwiribazujulmgy4.pdf
    • http://vufiwopader.medianewsonline.com/hng_dn_ct_file_bng_nitro.pdf
    • https://cdn.sqhk.co/fisejadiruw/jcjfhak/gauss_meter_readings.pdf
    • http://scotiaenlineape-personas.com/gexekxqxuh.pdf
    • http://espaceabonnes.com/silasor2cvmj.pdf
    • https://cdn.sqhk.co/medukukekuke/0ghWWjd/savaxizoxuwelopevuxaw.pdf
    • https://cdn-cms.f-static.net/uploads/4385412/normal_600a9e9a63c4f.pdf
    • http://shop-onlinediscount.xyz/salesforce_html_email_template_css31z1q.pdf
    • http://harkateine.fun/porefuxevakgknj5.pdf
    • https://cdn.sqhk.co/butituguxur/hcgh8hj/acrylic_nails_for_kids.pdf
    • https://cdn.sqhk.co/mizogujuzo/Figtmhb/22183708249.pdf
    • http://winoraama.site/man_in_the_high_castle_season_2_episode_6_cardc66y.pdf
    • https://cdn-cms.f-static.net/uploads/4484370/normal_6012419da9ce8.pdf
    • http://how2clever.com/argos_bedding_valance_sheetsrwq8i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://terumalok.atwebpages.com/98607816042.pdf
    • https://uploads.strikinglycdn.com/files/c3c009b8-a9a9-45e7-868c-597132983645/38629724409.pdf
    • https://uploads.strikinglycdn.com/files/45dc83fd-6155-4d79-bb50-8d6a78d13557/nonifuxefinizakubeg.pdf
    • http://tobidogajetu.onlinewebshop.net/what_is_validity_and_reliability_in_research.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d2d.bin
5b05af583a8e38f5ff2d47a19842dfc5e6c712c977248eb6303ad7668c0e654c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 5212 bytes
font_01_sfnt_off00012ee7.bin
ff476b10c85fe46948eebbce71cfa6d254c4fbee39fbf11d710a427f8d858421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 12204 bytes
font_02_sfnt_off0001566e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1566E 4324 bytes

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