Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b8b314a9f6cc14…

MALICIOUS

PDF

89.2 KB Created: 2021-03-15 04:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 566925a5d4796548a16412a361861b82 SHA-1: 2314a57a6ada92041d4d5e12bd335754653c542e SHA-256: 68b8b314a9f6cc144798512f6256313c84e3986d660635051cbc7179e1a290de
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm or SEO spam campaign. The embedded URL 'https://ponafet.ru/123?utm_term=latest+bollywood+movies+free++hd+quality' suggests a lure to attract users interested in media content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://ponafet.ru/123?utm_term=latest+bollywood+movies+free++hd+quality
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/2740656.pdf
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/8989516.pdf
    • http://gagivukamuw.getenjoyment.net/java_head_first_github.pdf
    • https://fegoparowewara.weebly.com/uploads/1/3/4/3/134321013/b647d64e50.pdf
    • http://maloxibosuveviz.iblogger.org/bilan_lipidique.pdf
    • http://sarobivavoma.iblogger.org/motorola_sbg6580_manual_espaol.pdf
    • http://kugowuvidaneno.iblogger.org/kugezonodojefububukojim.pdf
    • https://pigiburoletu.weebly.com/uploads/1/3/2/6/132695467/9601654.pdf
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/sutaguno.pdf
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/mipubitavuj.pdf
    • https://zegoliro.weebly.com/uploads/1/3/2/3/132303320/roberuzefex.pdf
    • http://vabowobumavenik.22web.org/how_much_do_small_plastic_bags_weigh.pdf
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/jelifatika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jukoxisojow/international_marketing_internship.pdf
    • http://simabox.epizy.com/building_portable_shooting_bench.pdf
    • http://fudedeki.rf.gd/the_theory_of_interest_kellison_2nd_edition.pdf
    • http://sajorasuxanuvil.epizy.com/capacitors_in_series_and_parallel_examples.pdf
    • https://s3.amazonaws.com/jojitagifuva/39847368109.pdf
    • https://s3.amazonaws.com/neporezofov/98203265332.pdf
    • http://gowasikokini.epizy.com/bathymetric_survey.pdf
    • https://s3.amazonaws.com/rivazixexuguri/90089695211.pdf
    • http://biwodonugawodil.rf.gd/how_much_do_cyber_security_jobs_pay.pdf
    • http://dopovis.myartsonline.com/32332321950.pdf
    • http://dukizovisepo.rf.gd/fl_studio_12_download_for_pc_windows_7.pdf
    • 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_off00011ef2.bin
95199144f6048382b2a8f20410c853d0412af446524d26af89d4fab459c1d4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 5608 bytes
font_01_sfnt_off000131f0.bin
e2de93b5550a87fbc9a993f2e40597af5f72b07f9f28d8e28732ea0d2d6b10e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 11000 bytes