Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb4deafc7e5ff3…

MALICIOUS

PDF

83.2 KB Created: 2021-05-01 02:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4426ed167165dfd0c5f2bcd52cf0ad92 SHA-1: 2529bb23df580eaa80b1e48b6e9642c8696e417d SHA-256: 73fb4deafc7e5ff345a24bc35325f3de4041c38b6a98b6cf534bc228e43acc1d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document body, though heavily obfuscated, contains text related to a PDF download lure, and the embedded URLs point to disposable hosting and link farms, consistent with malware distribution. The presence of external URIs and the overall structure suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=technical+communication+12th+edition+markel+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/gegatuzikat/5AtA2je/puraledijekibaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_6041aec0e3673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fd8a878995e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5ffe25b74281f.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/2856890.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/44764078076.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/como_se_cita_un_autor_corporativo_apa.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/chf8hjo/teacher_quotes_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_6043734db9480.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/2gcgdii/injustice_2_mobile_characters_ranked_2020.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/84282663851.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/black_and_decker_waffle_maker_removable_plates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_605215ab34bef.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/wonipazetaduginoki.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/adjectives_degrees_of_comparison_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filevixe.rf.gd/86339623073.pdfIn PDF document text
    • http://lefumus.rf.gd/92804087157.pdfIn PDF document text
    • http://miripiwamaza.epizy.com/bhaja_govindam_lyrics_telugu_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d620cc0-1055-426a-89cb-90a5837d2f40/52059172558.pdfIn PDF document text
    • http://fudavifakafolid.rf.gd/breaker_box_label_template_excel.pdfIn PDF document text
    • http://xasagamuforokek.rf.gd/bowuwojajifarusiwapaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af096e54-b0dc-4145-84db-a1d3c7494107/what_are_examples_of_social_learning_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690fff01-de6f-49bc-8ab3-626c0884af7f/pedro_paramo_english_audiobook.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 5504 bytes
SHA-256: bd4f676a2f238488ce36e084d7f2f01c3b3ceb89d752d54b55e61a6ef0d14d86
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 12124 bytes
SHA-256: ffe035d3ee0c076e353ee59a389bf1194e9ed5afd4a12cf74a82e75ffe70a569
font_02_sfnt_off000129a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 16084 bytes
SHA-256: 6049f7be1eb58524b2bfe5e0ab34f4300347f26dbb23ab6ad605e3b0d5647553