Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0872df9e125664…

MALICIOUS

PDF

75.9 KB Created: 2021-03-21 23:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7c409ffda049bc57919ba116c8b44a2 SHA-1: 8e196bbf42509b04d7b386b5eaaf453b55e6dc9a SHA-256: 4c0872df9e125664bef954e17c1990bf0692de28a8eaa8ac037fd7e4c32f0007
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=pewdiepie+mod+apk PDF link annotation
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/8377046.pdfIn PDF document text
    • http://lamozutejune.22web.org/how_many_calories_are_in_a_grilled_chicken_soft_taco.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6016c91dab2e2.pdfIn PDF document text
    • https://kisupumusu.weebly.com/uploads/1/3/4/5/134513531/lamimowawemil.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/is_alcohol_acid_base_or_neutral1n2r8.pdfIn PDF document text
    • http://cocobuka3.xyz/cut_the_cake_ball_gamen8o5j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470211/normal_6005e89913d1c.pdfIn PDF document text
    • http://vafijevimam.iblogger.org/badmash_dil_song_pagalworld.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/nomojud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60466c1df30e0.pdfIn PDF document text
    • http://sodalabs.pro/faxofizepatubikivomukigzabr3.pdfIn PDF document text
    • http://duwemoguf.22web.org/30061268516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_e86cb6dad8b647aab26707603c6b2359.pdf?index=trueIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_67ea2e41fb2443ff91624bd032a3a192.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_8135b541f2214753b879662d7baf6261.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d00c81-96b6-4414-af19-8c13b5d1f22b/vishnu_sahasranamam_telugu_ms_subbulakshmi_free_download.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_efe5e4c55ca64fad919973d586b717a6.pdf?index=trueIn PDF document text
    • http://nujobig.rf.gd/allegiance_flex_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69543be-312d-420f-84e8-bd6749649afb/5135483938.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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 4956 bytes
SHA-256: cbe7323fb24ec5f5b31238082bb0ae1c61c4fe84a31dbe893a55cfbd1c70cd67
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10924 bytes
SHA-256: 6df5b2d97594430ab63a36d6859225daba826bc5633d21fc8b497fcd411bf208

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