Malicious PDF — malware analysis report

Static analysis result for SHA-256 53201e53ae43ef0a…

MALICIOUS

PDF

101.5 KB Created: 2021-05-03 22:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cfd1154ae754a82781dcba34bcc8f414 SHA-1: a3927f483ed93e5f369ccefde75446e9edb254a2 SHA-256: 53201e53ae43ef0a7332e481b32496315a67cb4c5af9f4ba39efec1d8188ca09
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a critical PDF_MALICIOUS_REDIRECTOR_LINK firing, indicating it directs users to a known malicious URL. The PDF also functions as a link farm on disposable hosting, further suggesting malicious intent. No scripts were extracted, but the primary attack vector appears to be redirecting users to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=when+to+capitalize+professor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_603044316539e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_600ffd0e343d4.pdfIn PDF document text
    • http://egosikenclub.com/pivituhsbzu.pdfIn PDF document text
    • http://kernig.online/jamijupum0abd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5fcc76ecad940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_604e06f5922c7.pdfIn PDF document text
    • http://supsun-aero.com/lutivajulafsjke.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/plants_worksheets_for_grade_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gototura.myartsonline.com/ed_sheeran_-_castle_on_the_hill_letra_en_ingles_y_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/wofupax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c2f741-9c0b-4d76-9d9d-ba5232f8a366/how_to_replace_2014_equinox_battery.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_92cf2b0421f04e0f83c01455c96fcddc.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_458b4119bc6a41bcbec15c4dfa90272a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bb1810-6e34-49f3-879e-844c3d32e635/how_are_living_beings_dependent_on_each_other.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_b7c5fb98d9204d30922b9acf01decb52.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_425f6684e61a4a998af8d316024444be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/373c01f6-2a94-4df1-acdb-303b190fa1c9/dolamugopaken.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_c360bb6494184d2383da555ceda21727.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/177ebea3-834d-4d4a-b1ac-7a6c4797791b/how_to_setup_vizio_soundbar_to_roku_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/55072381436.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/ligozapozofumamepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc546abe-da49-49f4-ba2f-3ba0464c051e/how_to_find_log_125_using_log_table.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_off0001502f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502F 5164 bytes
SHA-256: 1fd7d1591f894a7ff73be1f1d235693a266d8c7a2a374603c4d84be3cbb40e98
font_01_sfnt_off000161d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D4 11532 bytes
SHA-256: d7d399d62a875c5477394859ee82cdccf0f7e24df637825c45d3aede2a7611e8