Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e97d3914daf9d6…

MALICIOUS

PDF

81.8 KB Created: 2021-04-13 10:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae55f154cfd1ac7fb4206ceaa6101415 SHA-1: 9f099cb1af04ef3f862d32710f5f868040449742 SHA-256: 39e97d3914daf9d64b685355283fc90072b36613ca8480f103636e3c02c1113a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It presents a lure to install a browser extension or update, and embeds external URIs, one of which is a link farm. The document body, though heavily obfuscated, suggests a user manual context, likely a pretext to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://ponafet.ru/strik?utm_term=keurig+2.0+500+user+manual PDF link annotation
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/tomom_viviluwigesokun_turarane.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/camelus_bactrianus.pdfIn PDF document text
    • http://libebilefopa.iblogger.org/caterpillar_3516_parts_manual.pdfIn PDF document text
    • http://gazupoz.sportsontheweb.net/98710541219.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/julugukerawe.pdfIn PDF document text
    • http://pollsexpert.com/aster_flower_information_in_kannadafydb2.pdfIn PDF document text
    • http://ganexofom.iblogger.org/mathematics_algebra_free_download.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/585228.pdfIn PDF document text
    • http://neuroncraft.online/65938617213bbdk.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/2dc6a63b-9085-4cc0-aead-eaef11ca6941/the_outsiders_worksheet_answer_key.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/strategic_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/fekenusigupon.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/bozobaduxesetulode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e9ff29-e90e-4ceb-8333-125c5aa6e00e/87760138790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08198e3-96e3-465b-a733-9c72eb51bd06/budukoton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fb9533-bb3c-4523-b53b-255b3a9165bd/waranutefeloraso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d4a197-b77e-4f33-9339-cf0bd0c511cd/21715404190.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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 5404 bytes
SHA-256: ff1ab0de72dbddee55a6a08aef1070ab3e2b19d5a685b6eaacdeaefd825efead
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 14208 bytes
SHA-256: 6df3f85896790063a415f9866b4146362b8af12150e13a1726182f66982d0e08

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