Malicious PDF — malware analysis report

Static analysis result for SHA-256 43347112d26662e7…

MALICIOUS

PDF

75.2 KB Created: 2021-04-05 18:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 89fb8815e534f7553e717464b91d7c4c SHA-1: aea8514a94c6343d8e7d4e17488d36c29d6a6570 SHA-256: 43347112d26662e719e3eaad7c74f86b4f3899d290bf0671ed2f4caae7b372b0
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=dragon+nest+sea+mobile+warrior+guide PDF link annotation
    • https://cdn.sqhk.co/kewusikata/Miehbhb/nuvaru.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/o9Lemgv/ielts_listening_with_transcript_and_answers.pdfIn PDF document text
    • http://fajamad.mypressonline.com/37629981992.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/Lhgjagf/68834635570.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/dante_s_inferno_ciardi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/yiamgfr/gamadudalelirizaz.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/fuluw.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/25446e4a-ae37-44ff-a6f0-e473daf84025/french_verb_avoir_conjugation_chart.pdfIn PDF document text
    • http://motuvulo.rf.gd/pentagramma_chiave_di_basso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a259a236-95ba-4c7f-bed0-c060eef08057/xozegafobu.pdfIn PDF document text
    • http://bowuxok.epizy.com/runiwipina.pdfIn PDF document text
    • http://gokosipok.rf.gd/27357808577.pdfIn PDF document text
    • http://libunasufukif.epizy.com/mhw_witcher_quest_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0785c2fe-7c92-4883-adb7-8d6015680442/15234474129.pdfIn PDF document text
    • http://mapiwenasadig.rf.gd/66363737391.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/bekojudakezejuv.pdfIn PDF document text
    • http://fudewalazakukug.epizy.com/advanced_english_grammar_for_native_speakers.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/castle_in_the_sky_piano.pdfIn PDF document text
    • http://kinowazekuponaw.rf.gd/30484846136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54609ab1-eb8b-4bf3-a7ac-ce0a241ed2ed/hp_envy_5530_printer_carriage_jam.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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5376 bytes
SHA-256: 018506242e494d1b7252122f6f8aca62eca782aae2f44ed663347a27cb94f39a
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 10340 bytes
SHA-256: 5c94588aace9a2ba055a91d8a34f1310e73b71cd745f7a14f1b0008181753483

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