Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fac345328eb33d…

MALICIOUS

PDF

82.3 KB Created: 2021-04-17 22:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c4f7740f344ab71261403f08715529c3 SHA-1: b2231b9133fa62d8268df2545bd44aaa84483df6 SHA-256: 16fac345328eb33d6eca3763ed2ac402a30d9a4d3da47e05a5499b7c25e2cac4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a "Raypak heater won't ignite", suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=raypak+heater+won%2527t+ignite PDF link annotation
    • http://tiktokfrance.fun/246699060259ajpd.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/didhdgf/novazux.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/hhqhbjg/tujukawiba.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/vanoxozijalik.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/business_management_degree_online_uk.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/3d718e731.pdfIn PDF document text
    • http://bet-info.ru/how_to_set_a_marathon_wr30m_watchj717k.pdfIn PDF document text
    • https://xubedemowixur.weebly.com/uploads/1/3/6/0/136004279/wuzokuzuxadop_dodekidelegazu.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/mopivabumex.pdfIn PDF document text
    • http://carins.info/gukomepovelyv36q.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/kazubezojukoturiz.pdfIn PDF document text
    • http://mamontov-net.cc/diablo_2_mace_class_weapons2gx8m.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/24465596500.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/2300185.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/1969088.pdfIn PDF document text
    • http://tesocoin.online/mouvement_hlicodal_exercice_corrig0q6nf.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/qjijewP/android_radio_button_drawable_size.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vajapojaperusu.myartsonline.com/a105_material.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/acca_f5_questions_and_answers.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/fitin.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/53884642686.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/brahmagupta_books.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 4956 bytes
SHA-256: 46386b7457bc45811ff547e3513852d6ced69fdc54f9d60e5335d7d65030d736
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 11392 bytes
SHA-256: 82eb31f8fdfcaaa7a0d4740f9d2bd67558cd27abe42fe035d6ac2f763f13fb00
font_02_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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