Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c39c5978ec2b671…

MALICIOUS

PDF

70.0 KB Created: 2021-03-10 19:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7f7b8bb09c5a0631221bb52e978c99c5 SHA-1: daeb9a07d21b3b865b530bc40be6292b4c6336be SHA-256: 1c39c5978ec2b671d69ed2ac62ba725981d26f08c3f60dbb16db064e6cbdd88e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/aws?utm_term=allen+carr+stoppen+met+alcohol+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501989/normal_5ff5042fee2b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_603c8719550b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5fccad9ce15ee.pdfIn PDF document text
    • http://jewlgems.com/el_verano_feliz_de_la_seora_forbesydcm8.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/82491976803.pdfIn PDF document text
    • http://wildber.store/mekewevutxlgdn.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/wetiwexuvizilixitul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fdc199c5d73d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456378/normal_6008cf3411c9a.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/rijejag.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/what_is_the_magnitude_of_gravitational_force_between.pdfIn PDF document text
    • http://mipuwuse.22web.org/xazojupagit.pdfIn PDF document text
    • http://okclub.org/the_selection_movie_free_downloadere3eya.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/f4c9c9c5-4cc1-4f46-88e7-47f5d328f171/2006_honda_civic_service_code_a14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e933ea3e-5b5a-496f-94c6-8a667c8b5535/4958150900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a6a7e9-5051-46aa-b594-bba4973db08b/is_dunkin_donuts_open_on_christmas_day_in_massachusetts.pdfIn PDF document text
    • http://sozanizitug.epizy.com/47560748484.pdfIn PDF document text
    • http://potimafekun.epizy.com/735432399.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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 5384 bytes
SHA-256: 644e13fc85428fff25b180477e16f4cee59173f4265032d64ef420527beefbfd
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 10120 bytes
SHA-256: b76856701f8d45db11f5298c8d1f0ff462bcd6f92bf855fb87f57967ca2ec4e4

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