Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fdf2e3efcaba01…

MALICIOUS

PDF

83.7 KB Created: 2021-03-12 07:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4709bc452cba79c68a1eecb5a1de3bf8 SHA-1: dd3df0445520f7f6d8435a4752f02a8fc37997a4 SHA-256: f2fdf2e3efcaba01086b2c21d83f67aafa85184f0b252bbb8d53e19a6e65855a
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL that appears to be a lure for search terms related to "quantum chemistry and spectroscopy pdf". The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to a malicious site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=quantum+chemistry+and+spectroscopy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408589/normal_6018bac7723b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5ff4eded09be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_5fd34ed2259ac.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/33029044457.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/22737907549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fe3a4e781e60.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/472314072.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/calderas_industriales_pirotubulares.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/kedevam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_6044c964a1d4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5fc697864222e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_6026ab3b67a78.pdfIn PDF document text
    • https://rolivexume.weebly.com/uploads/1/3/0/8/130873784/dunobok_kovagemopodezuv_valevije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454049/normal_5ff677a59cf69.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/zamafagerona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_6024b45647a62.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/1e337a47-0e43-4375-92c9-f1c1a17a86f5/dyson_owner_rewards_hair_dryer.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_16a92911233a4a77933342873457a649.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_e63e6e45c895489982b7b88c25bd23a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf08a46-a144-4c32-99e9-c7f4c75c0ddb/las_medias_rojas_emilia_pardo_bazan_audio.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/what_is_the_cold_equations_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dc8307-0f8d-4caa-b8ed-005a18c376f7/761672133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f5589d-12fc-42ab-9fe6-fb406b7c8537/duraflame_space_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5652d1-aa24-4585-8782-e3d8d54b1414/how_to_use_suddenlink_cable_remote.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_53573dff90db48c29cf4d784ac9b55ce.pdf?index=trueIn 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_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 5528 bytes
SHA-256: a1d15890ee6c4c3987e62a75cde9c5135ab4dd1ccd8c14a2a4a27515f2dab18a
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 11856 bytes
SHA-256: b7e8433ef74ebc398ded1c1a57f0dfe9b8b6309229deba347f0f8156a79a695a

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