Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc3d550c6743383…

MALICIOUS

PDF

73.8 KB Created: 2021-03-28 11:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ed4a754de34b6c3777aeb46dd0406e99 SHA-1: e39f9cebd52c7d6caf3d748e2e9408ea27ec9efb SHA-256: 1fc3d550c6743383d36fb41ae98e5f1482c24f4307ea79939859bfa5bc278487
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which point to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Philadelphia news reporters' and application metadata, which likely serves as a lure to entice users to click on the embedded malicious links.

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://fokemale.ru/123?utm_term=philadelphia+news+reporters PDF link annotation
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/dotori.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/comparing_fractions_with_unlike_denominators_worksheet_4th_grade.pdfIn PDF document text
    • http://difononipasa.22web.org/bastien_piano_book.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/antennas_download_free.pdfIn PDF document text
    • http://daxepekudinis.iblogger.org/nms_surgery_casebook_free_download.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/binary_search_tree_deletion.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/vupimuwogenegedibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_603f8b5300daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_603cc7a45701a.pdfIn PDF document text
    • https://mogiwivimar.weebly.com/uploads/1/3/4/7/134731652/lelenege.pdfIn PDF document text
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/wixutefexijin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf7d2b4-0e64-4cf6-97b2-fb2a172c1032/how_to_set_up_beats_solo_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85da324e-2b42-4c49-952e-70abc48e6a86/80415416665.pdfIn PDF document text
    • http://kakininutopojub.rf.gd/39884199100.pdfIn PDF document text
    • http://zopimejumujodeb.rf.gd/2017_harley-davidson_touring_models_service_manual.pdfIn PDF document text
    • http://pidusuzelaju.epizy.com/nanavabikudofofawo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 5140 bytes
SHA-256: 91f332621224ec6aa748aa108d8b6b21d8ef316ebb47b7fb37b995e6a9e76499
font_01_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 10812 bytes
SHA-256: 20fe20d6060eea8d26adbf1abea1d6f60e56be6e5fae80b4bc49416721bde362

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