Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b2df8d6184f3c…

MALICIOUS

PDF

91.1 KB Created: 2021-03-28 06:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e76b69396a4dea24dbac8c26b64e9f21 SHA-1: 50be5ed7b05df20ecdeb467ddd62e81cc78104ac SHA-256: c52b2df8d6184f3c927b0bbd76788069db8f53b05eed36cad6e0e4cf7ce6ecd1
166 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one prominent URL pointing to a domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to device repair costs, designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/strik?utm_term=samsung+sm-t580+charging+port+replacement+cost PDF link annotation
    • http://vujenixuwo.mypressonline.com/conductivity_of_copper.pdfIn PDF document text
    • http://tixshopclub.fun/shark_rotator_powered_lift-away_vacuum_cleaner0qhok.pdfIn PDF document text
    • http://vusejulene.iblogger.org/word_label_template_4_per_sheet.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/6112980726.pdfIn PDF document text
    • http://wuvovewapug.iblogger.org/24883592153.pdfIn PDF document text
    • http://fufenibovuxe.iblogger.org/51569771548.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/shoprider_mobility_scooter_battery_change.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/lukozewidezuw.pdfIn PDF document text
    • http://rotugozebowovu.iblogger.org/does_g29_work_on_pc.pdfIn PDF document text
    • http://romeital.space/filetuvivopiju05swl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/newawaniwijelegadalijonuw.pdfIn PDF document text
    • http://viminug.epizy.com/mumorewupiwek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e9d97f-f722-4a3a-a6f1-4e3135a8370b/suwudoxiwubofe.pdfIn PDF document text
    • http://xenegivijofawok.rf.gd/international_mail_manual_section_922.3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a01fac-db40-4475-83ac-4dd835255ffe/xatexom.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/almug_icon_pack_free.pdfIn PDF document text
    • http://naxezutozotos.rf.gd/run_android_sdk_manager_linux.pdfIn PDF document text
    • http://moximavekujalel.epizy.com/fapuvofekijupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a984ce40-513a-4a5a-ab47-e3665d94a323/34410177152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2fde59-efcd-4a03-8743-294295ff621f/58651693787.pdfIn PDF document text
    • http://tuwemipidepu.epizy.com/vudusun.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/video_er_professional_for_edge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df666fd6-406b-449d-9a3c-2193b3c641f6/gatakezuxibexikawerubela.pdfIn PDF document text
    • http://belajuba.epizy.com/90621650578.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_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 3488 bytes
SHA-256: 47b57b2364547d8598f2bdb7df7059a67e79c3981864ae66996749944a51b5b2
font_01_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 5940 bytes
SHA-256: 36980717559591b6d18db62335d0fd14ea46e44e0b40416d6668b4962bd75e90
font_02_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 11556 bytes
SHA-256: 01e8692441bd584e048cc3b903da96ed7d74d08fbff4face89c43560f9f7643b