Malicious PDF — malware analysis report

Static analysis result for SHA-256 48842c4a4f8c3b3f…

MALICIOUS

PDF

74.9 KB Created: 2021-06-10 14:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50639f590c625db995f733e9bedf5903 SHA-1: 22252cf878416598c47776868c79646850567ca1 SHA-256: 48842c4a4f8c3b3fce95c87bafe0684ecaf3606a2564e790280cfff86b159e20
186 Risk Score

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=apa+7th+edition+example+citation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405639/normal_600b0290e39dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_60b986a4665a1.pdfIn PDF document text
    • https://tapojanez.weebly.com/uploads/1/3/1/3/131398133/paxawevexoxuvosu.pdfIn PDF document text
    • https://vimubuko.weebly.com/uploads/1/3/4/6/134687604/38cba7622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fec55575dfe6.pdfIn PDF document text
    • https://xeluxujuw.weebly.com/uploads/1/3/4/4/134438775/9323843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5fec75d3667b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5fe295b6c90f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fdfd86f24af7.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/b019cf5aca7.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/wezirev_zokezuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_5fd349612760a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_605a1093d3772.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/ca3ff2a3-5690-41b7-8cdd-aea02369064f/what_do_you_mean_by_scarcity_and_choice_in_economics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853c3873-f6bb-4ceb-a6d5-0be3f9cbb446/britax_rmer_bob_revolution_pro_jogger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469fc4f1-738a-4b6e-8266-fbf383f94d22/how_often_to_drain_lg_portable_ac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c088aa-2f67-4978-b7e2-bc83941f91d4/how_much_do_senior_marketing_managers_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6458476c-f9f9-4fda-867f-92160ee32cff/positive_attitude_activities_worksheets_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402904fc-69e6-4349-8043-0a3a3a2d8ff4/nordictrack_x11i_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca71f4e3-a6b5-4175-b8c5-49896d8d2fde/what_are_the_characteristics_of_renaissance_sculpture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d980dd4b-3180-48e6-b7e3-7550ba1a53de/69724775176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9354aea5-3996-4b5b-af4f-3412f7f262c3/boraf.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_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 5176 bytes
SHA-256: 4ab24f4e60e6d2cdd8b2c68e833e75a1c3e02c31b259091d0f435ca94cd97269
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10880 bytes
SHA-256: a4f0442a1aa12e1f49bd38ffb4cc8019651a484a433d604ef682112eb5e5ffdc