Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cbe7386dc153d5…

MALICIOUS

PDF

74.2 KB Created: 2021-03-04 17:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a4231b5b9786726a6b5a8e4ecd131c35 SHA-1: 82dadec3ece602b481bf0dec412250ef10acb6e6 SHA-256: f6cbe7386dc153d585bb474a3b5adb54a552bee2f5bf33428b58d426019fe869
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=what+is+the+meaning+of+active+and+passive+fire+control+measures PDF link annotation
    • https://cdn.sqhk.co/zujubiviv/Tjdhe05/jump_spiral_slide.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/jjffMie/teddi_mellencamp_net_worth_2018.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/oster_10_cup_food_processor_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fd6acdb41bca.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/agjvTKb/bipisoposuzavu.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/EEjfia3/speech_my_60th_birthday_party.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5fdf7f0d34f96.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/sasubageka.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/macbeth_shakespeare_modern_english.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/oMAjb6Y/92064984384.pdfIn PDF document text
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/de6b7386e80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_9f3735e48f4b474cb9ca7dbcf12dcf6b.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_af372258a5b84a179e3b99da9180fd04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dc59ba-0e8e-48aa-8738-7a638f6187e0/65267903317.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_39b681d3dc2146d3add856690ab4eab6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b78ebb-a236-48a1-91c0-1c52742b7f36/generac_gp3300_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efdb587-3561-4cb5-aca1-7c80f59ef24f/watamino.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_ddb1f3fac37247ff9bd1672fda5504d5.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_b12fb254e3d04d7ebb48f10ed46adced.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 5644 bytes
SHA-256: 3cabbeaefd0c4a6d3b268dfa45cb51bf1d1b3f0f436bd2e3309fe3e7a50a9b0a
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10756 bytes
SHA-256: 7e8c69834e7ce707599b4d965398fc46393e2bfde059e49ab5890a828cdbf3f5

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