Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f977819b0f9f64b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 15:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad506815d397f4a1a8d22b98a4cf8318 SHA-1: ee0aeb1eeb0fe5903107da200a081c053e94d8d6 SHA-256: 0f977819b0f9f64b55b24054c1b075d7e2acf7f9775d92382c9c817d07366e0b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest the document is designed to redirect users to malicious content, likely for phishing or to download further payloads.

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://soxebez.ru/aws?utm_term=biochemistry+book+pdf+by+satyanarayana
    • http://vexetifiridik.mypressonline.com/pufitafezodebesi.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://henrysavbr.site/gemaj6ajuz.pdf
    • http://itwow.info/aashto_roadside_design_guide_4th_edition_20114vbz2.pdf
    • http://delinapod.mypressonline.com/88181989454.pdf
    • http://rumurel.mywebcommunity.org/2000_honda_accord_oil_light_flashing.pdf
    • http://fofumumitem.medianewsonline.com/star_wars_mandalorian_ahsoka_tano.pdf
    • http://xoxuvajes.mywebcommunity.org/electrical_theory_quizlet.pdf
    • http://melomone.scienceontheweb.net/trouble_obsessionnel_compulsif.pdf
    • http://braco.ru/tekukunafetugukapu8qwpw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_484d22231f4043f89849a2308f850f56.pdf?index=true
    • http://bemabam.myartsonline.com/minupifepavi.pdf
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_b28d5919ecfc45b9a43f4da6a1f4b6fb.pdf?index=true
    • https://s3.amazonaws.com/zunaduxa/soccer_ball_template_for_pumpkin.pdf
    • http://lazuletezofik.onlinewebshop.net/calibration_manual.pdf
    • http://vekamujibatebig.rf.gd/angular_6_by_example_free_download.pdf
    • http://tetaxejil.rf.gd/airport_codes_by_state.pdf
    • http://kezasifofajimo.rf.gd/thousand_splendid_suns_quotes_by_chapter.pdf
    • https://s3.amazonaws.com/magapeguwabe/83956315069.pdf
    • http://jufebiwewizeza.rf.gd/wing_chun_wooden_dummy_training.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_off0000edc2.bin
0cf68b3c3a4e2619190dcf79a5741ada4e2f5aaa9ba80e9a49613624063576eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 5720 bytes
font_01_sfnt_off00010110.bin
ee5c64efc7738722db8f7dab4f5a60c01da1aaddc23848809e5b9917da498130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10596 bytes

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