Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd8ac1ce54a3cbc…

MALICIOUS

PDF

86.0 KB Created: 2021-06-11 16:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ac2c09b45efa73e710bfec9433e4cf23 SHA-1: ccf451a3929d0eaef22bc35c9e72a328d795d3df SHA-256: abd8ac1ce54a3cbc28f7063c5cc9fd875ac16e4266cf5d0ebcb827a3ee326594
126 Risk Score

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 0.9990

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://midufefew.ru/123?utm_term=google+sheets+query+function+another+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6010a5b038f42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fe4fe4397d2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_6057a3626d89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_600dcb122d7ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_6007be0922069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5fefb8a28f4d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_6010a4bf16adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_600a15d7d769e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_600e22b74fb27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_60bbb5574d50f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_5ffcb262832f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wasosux.pbworks.com/w/file/fetch/145056441/editable_march_2021_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bb8e53-b990-4ae4-b5bd-569112d12282/47808853048.pdfIn PDF document text
    • http://kuduwoxux.pbworks.com/f/oxford_picture_dictionary_english_portuguese_free_download.pdfIn PDF document text
    • http://gamanovu.pbworks.com/w/file/fetch/145073394/zedezefigegip.pdfIn PDF document text
    • http://suwoluran.pbworks.com/w/file/fetch/144916509/1975576510.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144739338/99301763472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f6d476-2885-4b01-9442-9896ffe69610/78628434425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efb5d5c-e728-4ee4-9d3f-2fb5dee35603/95287384801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7218d6f-472c-4eff-b45d-52ebd81587b2/67423248945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640324e0-572c-40f5-a038-ef8b128a5c77/rikexubisuki.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/12062453384.pdfIn PDF document text
    • http://dowiginade.pbworks.com/w/file/fetch/144820626/92911788351.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/w/file/fetch/145013301/bullet_in_the_brain_discussion_questions.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_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 5284 bytes
SHA-256: 876c815eb87314014ac3cc61dec1015889cc62505e50337275e46b3ea0091127
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 11628 bytes
SHA-256: 29df2c89605f51b30a2f1a4d533650f37b8b338124cf3c4c115c03ca6d5d107d
font_02_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378