Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bd055b084e8895…

MALICIOUS

PDF

92.2 KB Created: 2021-04-12 11:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6da2200958294637a34728a0c8c235da SHA-1: ed8d2a5d930cbc15b7342119feb936f7e357b0f7 SHA-256: e2bd055b084e8895f4b5fc2ba828ec0d789c9c1a9b6156c2c284c843830f0540
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URL `https://resalured.ru/strik?utm_term=como+hacer+un+inversor+de+voltaje+de+12v+a+220v` and the presence of multiple PDF links indicate a coordinated effort to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=como+hacer+un+inversor+de+voltaje+de+12v+a+220v PDF link annotation
    • https://cdn.sqhk.co/wisewuguv/hdhajb1/ludilibixukonek.pdfIn PDF document text
    • http://nezatarofarix.getenjoyment.net/add_and_subtract_fractions_with_like_denominators.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/z8nFZib/mozuvesewarata.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/ijfignM/3328336990.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/hf8igeX/kopodeduseluvoronu.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/jam2_speaker_pairing.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ji3jenQ/celestial_fleet_v2_starfleet_warfare_3.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/34648650829.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/jfhedME/90344907664.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/hgDgjEt/lubukudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jazopizebe.atwebpages.com/writing_academic_english_fourth_edition_answer_key_free_download.pdfIn PDF document text
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_5c88aec2c83545efafede49210713b46.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_7c2c874323304ca497f4b393c245f853.pdf?index=trueIn PDF document text
    • http://wilaroxu.atwebpages.com/anggota_tubuh_dalam_bahasa_arab.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_e60532a4ba164a6898fd6c8d10588d46.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_f7619a5a42c94fe9b4c5b6e767e9a3ff.pdf?index=trueIn 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_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 5548 bytes
SHA-256: 9bc59702341009cd150289af9cc56a26cc58f4c7abf48a5055d1e101d44edced
font_01_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 2260 bytes
SHA-256: bbab14ae9502a6fe5e99b5f422523261ac1a8a2dd2528af28f1c46268a6fe738
font_02_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 12856 bytes
SHA-256: 9d3e661739dc30705d7da55b3071c9e51f6418bc00d2d32d9acdf1242aef19c4

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