Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ab2c2f7e025e39…

MALICIOUS

PDF

74.2 KB Created: 2021-02-12 18:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 428dd79ec3fd263cb94a65227bf204a9 SHA-1: 837ffecd2913258e0c6a2d82aa7d35def43365da SHA-256: 90ab2c2f7e025e39b09ab2f59850e95abe1035eaf6d4d2d44a7ddb416f5a81f4
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=garry%2527s+mod+darkrp+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6015f0ebaad1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fe4cd66ef4da.pdfIn PDF document text
    • http://dutov.org/demepakowet0ii6.pdfIn PDF document text
    • http://lg-copyright.com/sounds_quiz_guess_the_songs_music_popxftbd.pdfIn PDF document text
    • http://oneitshop.info/engagement_party_invitations_templatesp7buz.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/Jmjdjjs/jevufibiwomasopisuta.pdfIn PDF document text
    • http://bonus332.site/749085259299dtj4.pdfIn PDF document text
    • http://kungfumalibu.com/asciidoctor_themes2phpk.pdfIn PDF document text
    • http://itawomen.fun/23176513606skac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_6006ac628ea9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478123/normal_5fcc1b931591f.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/rupatojuko/sim_card_usb_adapter_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/jnc_8_guidelines_classification_of_hypertension.pdfIn PDF document text
    • http://zudozam.epizy.com/vezaromupukobugegaki.pdfIn PDF document text
    • http://mekigutesazi.epizy.com/what_is_the_android_equivalent_of_siri.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/free_printable_worksheets_comparatives_and_superlatives.pdfIn PDF document text
    • http://pakekaririwofas.rf.gd/aldactone_davis_drug_guide.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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 5480 bytes
SHA-256: c9acd174c2e5d7a33a3cd41d5dfe4d03ec5c1805b91ea710deb254801f63efb2
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 9924 bytes
SHA-256: de7d854e101734867554e42c6fb57ab4979b48283d4bfac13748a56a4326a451

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