Malicious PDF — malware analysis report

Static analysis result for SHA-256 449b1deaf4cf8640…

MALICIOUS

PDF

84.2 KB Created: 2021-03-02 09:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8430d14c58e2934a1684a26fc3fb42c8 SHA-1: 38ecbe2649fb3ba51341bbdcea437e032b283b03 SHA-256: 449b1deaf4cf8640fffa204f51261cbd8a5bbbfb294bd4cdfc0fb4e94ec6ca79
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=leatherworking+guide+3.3+5 PDF link annotation
    • https://cdn.sqhk.co/nadovexum/bjatHid/80996163946.pdfIn PDF document text
    • http://magnitoli-2ekran.site/fundamentos_de_biologia_celular_y_molecular_de_robertis_gratis6hmqv.pdfIn PDF document text
    • http://dvertsoff.ru/classical_mechanics_taylor_chapter_7_solutionshnh9y.pdfIn PDF document text
    • http://chunyoo.com/tavonifijejinuwuduboszbmp.pdfIn PDF document text
    • http://spencermcman.us/51633975438b6xj0.pdfIn PDF document text
    • http://kalavar.xyz/galaxy_grand_prime_pro_price_in_indiabpvoy.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/ghcjj35/74800176155.pdfIn PDF document text
    • http://moneymaya.site/characteristics_of_transcendentalism_literature14d1o.pdfIn PDF document text
    • http://ttttrrrr.space/75349092554kfx4w.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/cgdgehd/49055232638.pdfIn PDF document text
    • http://petrol-v-pol-price.site/mechanical_measurements_6th_edition_solutions_manualkrmmf.pdfIn PDF document text
    • http://veronaital.space/duvafikosetekiz2qlyw.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/futamo/arista_virtual_eos.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/zidijolonekogasizej.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 5296 bytes
SHA-256: d9cf16495cecfe5e71fbb4c00331aef8d6da8c6345d473f47bb372cf2f3bbf84
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10348 bytes
SHA-256: 6708496db8a7e70439535a1254efcc88f4ec4f2af27e05f78628715488d4d2eb
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 17500 bytes
SHA-256: 37da0162fe5fa3a53a29baff1fa8754da6bb3ae16f7dd75053517bdd47adef2c

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