Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a5578e1bb1c608…

MALICIOUS

PDF

74.3 KB Created: 2021-04-01 19:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d8d5a200680ae2c6c8dd6bca56e8207 SHA-1: dc6a0a6aa30df3582246d8ef33c3ef737a79720f SHA-256: 90a5578e1bb1c60860a4c201b57ba82bd9dc3fe948a7c9a468fe83b6cb00e53b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to benign-looking documents, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://zajinet.ru/aws?utm_term=amped+wireless+extender+setup+sr10000', is presented as a search result, indicating a potential lure for users seeking information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=amped+wireless+extender+setup+sr10000
    • https://cdn.sqhk.co/xudevekelefe/epjdIjc/checkers_28th_street.pdf
    • https://cdn.sqhk.co/wixefawoz/geXuj5P/pekefupixa.pdf
    • http://tigixupog.22web.org/magic_bullet_theory.pdf
    • https://cdn.sqhk.co/kosaboze/khdcdjb/surah_yasin_file_type.pdf
    • https://cdn.sqhk.co/zurefaxenov/3WOicjg/pokemon_sword_and_shield_event_legendaries.pdf
    • https://cdn.sqhk.co/xewumoxu/hjgcw8E/gilugepavevokawaxujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nopomewegobij/chicago_citation_guide_purdue.pdf
    • http://jiboleramar.epizy.com/cholamandalam_claim_form_part_a.pdf
    • https://s3.amazonaws.com/gazitif/bertelsmann_transformation_index_south_africa.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/42199110837.pdf
    • https://s3.amazonaws.com/zupenafud/13810327100.pdf
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_0acce60b6be64217932e7f9413b1219b.pdf?index=true
    • http://xowevabi.epizy.com/korg_volca_sample_guide.pdf
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_4576d07c68094f348de0d3af18847481.pdf?index=true
    • https://s3.amazonaws.com/setaxilitozuko/86537004134.pdf
    • http://mudozegiviw.epizy.com/opera_web_browser_vpn.pdf
    • https://s3.amazonaws.com/makumapikeze/overlord_vol._9_light_novel_the_caster_of_destruction.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_2a28f5940f6a442d95c112d247f98b8c.pdf?index=true
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_d4e6c78be1ea4ccb90ae280eab41eb81.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_4ed283898ad94e65b3d10cbc53c46ac3.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63b.bin
508ea0a06a2d52eeface818001e4c942f2e66b3e3dbf81d24a5f51e5b34f6f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 5240 bytes
font_01_sfnt_off0000f815.bin
e215b2d3eb3820f94fe4b0e4ac493c104dc3e61ad229dd7e012d9cdf9516c4d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10584 bytes

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