Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa55ac1cb3052462…

MALICIOUS

PDF

90.1 KB Created: 2021-06-09 08:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5dac68b3489bc4a811dfc78db614169c SHA-1: 13905f9059d5fad1d74d74f167a0c267c1bcc2fd SHA-256: aa55ac1cb3052462c52ade5a6845c6ce431c5569474cb23e12933032dc7eba6c
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 0.9992

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://infrive.ru/pbw?utm_term=bloons+tower+defence+3+hacked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463824/normal_60232b54194ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_601977e9f3441.pdfIn PDF document text
    • https://bonizilolalov.weebly.com/uploads/1/3/4/4/134458774/vomizupume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_603914be69d3e.pdfIn PDF document text
    • https://wudowesowuzoka.weebly.com/uploads/1/3/4/5/134584143/xebepoduvezaf.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/mixukezuwevola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_600ae5ca58991.pdfIn PDF document text
    • https://sawobefuridavo.weebly.com/uploads/1/3/4/8/134895752/a2394e8ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fd2a50512e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fe8858ca1712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_5fd62bb3a2a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_60471532ba5c9.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/76f76075-a6c2-4adc-afb6-4b309836f09f/67215848645.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/tulazisemugig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ff016e-6fb1-47ee-b37c-28306ab30d74/char_broil_tru_infrared_parts_lowes.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/f/milena.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144912984/fimopulojevudese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fbac48-3287-4a69-8a1f-c5252a13396f/is_there_a_grace_period_for_dot_medical_card.pdfIn PDF document text
    • http://zanikofepaj.pbworks.com/w/file/fetch/144841599/dragon_x_dragon_evolution_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfac154c-1f6c-41e8-932b-bf8a1e976a21/what_expenses_can_be_capitalized_irs.pdfIn PDF document text
    • http://wetavun.pbworks.com/w/file/fetch/144913683/what_is_movement_in_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b7bafc-bb3e-4e8f-ba90-af46cce6bdb4/goodwill_meaning_business_law.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 3960 bytes
SHA-256: 8b34eff26f7f378c4bc7c793c4577db903a14ac29c828d5aed080a6c3ee1a080
font_01_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 5476 bytes
SHA-256: 97fc691d0a5b42b00701250dda29d66b82a142a7c4b310c7351e1c4db56e2ad0
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 11212 bytes
SHA-256: ff945ca53280fa0873eaac3caa1be15c667b8fa51fb54459b415db25d5b8e909
font_03_sfnt_off00014516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14516 16168 bytes
SHA-256: 22c3ba09e8cf1325a54e3cd3bb657ff99244ae793782a272ee343ac892b84c01