Malicious PDF — malware analysis report

Static analysis result for SHA-256 690d4c571eebb37a…

MALICIOUS

PDF

82.1 KB Created: 2021-03-17 19:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f5522d7f086aee501f1bab662809544b SHA-1: c3c6b9f6cb0640526037e8498baf9fa480abb4df SHA-256: 690d4c571eebb37a940a81fcc9a8c95d43db6c1bbfdb8c3db6291e892129cf77
186 Risk Score

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, indicating a link farm likely used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic confirming the suspicious link structure. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful external sites.

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://druttle.ru/123?utm_term=alive+after+the+fall+book+pdf PDF link annotation
    • http://finuxezanasa.mygamesonline.org/how_to_tell_if_roomba_675_is_charging.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/ceremony_silko_free.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/nijenugifipagofebomexax.pdfIn PDF document text
    • http://duzegotola.medianewsonline.com/nemoveto.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/nigave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desujiruvomeb.myartsonline.com/apache_camel_in_action_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75dc332-51f6-44f5-91dc-5610cf815946/how_much_do_nasm_certified_personal_trainers_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df61e7c3-305c-46cb-af55-454b7765ce18/zudesiruwalikoziralodaxaj.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_40af9664fd214201853e82edab2d85b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50900b37-3efa-483c-9115-1e49b0b6eed6/free_graphic_design_software._simple_online_photo_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24db5468-f89e-4463-bf01-723bec77036e/89227434829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b857190f-f39e-4f01-b578-208bd4ea858f/where_is_midnight_in_the_garden_of_good_and_evil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe0260f-07ca-4405-9266-b20602ab2031/13990743347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b78432-e349-449c-b2db-4003aa4a69b1/dell_optiplex_960_drivers_free_download.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_9007a33fcc04416dbfa39d7969a04eae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/972c7104-733e-489d-89f2-b523b34dc05b/pentair_easy_touch_panel_no_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5adc0df1-b246-401c-8b6f-98e3327e4623/resukomidagutez.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_9ded999ef84049e796e0cec9d89d96d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43706823-f157-43d6-88d3-2ba5da223ef6/pixie_5e_monster_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14275f91-4011-4327-bd7f-9a9b72a474e4/mental_status_exam_example_ptsd.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_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 5204 bytes
SHA-256: 2ab9759c667ea423f6348671d3c8df48e66a7a80e88416efd42e3e692e002d6c
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 11684 bytes
SHA-256: 3f68d58984c6e66375b8d1a7ab3beda30b2093b600a9372b552391b009dd9b85