Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba237f265c56388…

MALICIOUS

PDF

76.6 KB Created: 2021-02-28 04:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: e65f294b695391454bbb9e501dc3b817 SHA-1: 74cb5ed47131c33ac524cb55eefc0e7616a55cf4 SHA-256: 1ba237f265c563880c5935fa39acd09c797c2140950fb80b9467907fa03567d8
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to career development, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jottigo.ru/123?utm_term=personal+development+plan+career+template PDF link annotation
    • http://bigmagazin.xyz/kididafibubipovokajudo51qnc.pdfIn PDF document text
    • http://armada.technology/2013_acc_cholesterol_guidelinesivap9.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/28124012809.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/acido_nitroso_ecuacion_balanceada.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://siniligavaxuvul.onlinewebshop.net/cannery_row_book_sparknotes.pdfIn PDF document text
    • http://kewumexor.epizy.com/baahubali_3_full_movie.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/what_to_expect_in_pre_marriage_counseling.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/73266113732.pdfIn PDF document text
    • http://dovevane.epizy.com/washington_redskins_record_2019.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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 5020 bytes
SHA-256: 7f51c092ee42822c8b5c78cb0166b698972b9f637c3addde6f13db4e42ad9416
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10652 bytes
SHA-256: 47aeeb9baa32d0106b83f545a661a396c0a65c888460e3b1059cdfa2ea87bac8
font_02_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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