Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc65b07868a40782…

MALICIOUS

PDF

78.2 KB Created: 2021-04-23 06:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: eb58d2bcc393f31407e1e3a08607a8b1 SHA-1: edebc999943ecad8a02f17ff768aeba8ee1d3120 SHA-256: fc65b07868a407820eed5a9b4aa88cdab8d382d2d58dd28061330081b7f30e3b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a primary URL pointing to a site that appears to be a lure for 'spectrum remote codes for sony bravia tv'. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to redirect users to potentially harmful content.

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
  • 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://jacksth.ru/strik?utm_term=spectrum+remote+codes+for+sony+bravia+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379241/normal_6010897b94bdb.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/einsteins_dreams_review_59e59.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/velisavenafi.pdfIn PDF document text
    • http://mupejejewij.iblogger.org/lunogukizikukerepog.pdfIn PDF document text
    • http://bestplacefor.rest/58864916503kuk2u.pdfIn PDF document text
    • http://brosbass.com/zedokovizalojezuwuf6u241.pdfIn PDF document text
    • http://mugedly.xyz/54026605094gui2s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_606aec010e9e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409250/normal_5feff5faeefd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_602cf656c26ab.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/remufuzu/918699145.pdfIn PDF document text
    • http://juvotam.rf.gd/1434827584.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_fbbe74baf25e4a23beb8d75a09e1839e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/what_is_co-prime_number_meaning.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_c5082cdb18724c38931a4ba92e3ca517.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_947faad5470045869fd4fecec4c9cf91.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_e6232bf73a324be2a08c5664d0a17c80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kufazete/lava_android_factory_reset_code.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_3c53f611888545faaa5a732fc0f706ac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 5672 bytes
SHA-256: f1fa7adba30ff0d34dda96f21ab242d4958164272f7c08b44f9eb3cfedba6743
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 11304 bytes
SHA-256: e475babb176d651545702e4897d275619f14289c2f1fdcaccc4ad600e2059ccc

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