Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bf4ca9afe6b043…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 04:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5a94b6e3c645ff598465a2f08794d50b SHA-1: a983fff084b1718e0236b4d468c1b9ad353a014d SHA-256: d5bf4ca9afe6b043373d68fcc761a89a84047ec264d843173cbfe3e80b7d0b7f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://bologen.ru/123?utm_term=i+will+miss+you+in+spanish+formal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477147/normal_603824fc66d4c.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/fumot.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/1933268223.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/ajdrjj0/xarus.pdfIn PDF document text
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/0023bc3db3.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/18770511802.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/bhajhE5/road_accident_death_in_bangladesh_2019.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/grim_dawn_forgotten_gods_best_nightblade_build.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_5fe6d6f010bec.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/sawabesonamiwakega.pdfIn PDF document text
    • https://favudifobesevum.weebly.com/uploads/1/3/1/0/131070497/1174076.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/2ieZifu/22005526613.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/mhhCiiY/heavy_duty_chained_tractor_tractor_pull_game_download.pdfIn PDF document text
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/tivuminezetarol.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/hdrijjd/murder_mystery_2_halloween_2020_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/19764012251.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/ge_cafe_gas_stove_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/medical_surgical_nursing_gnm_2nd_year_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/famuwor.pdfIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_5297ffbd9b734f05b4026404a7737c22.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_85701116c688449fb330789aabbbf757.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_d1bf3e5fba9747fe951a8e956a88ee4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/letter_format_for_noc_from_fire_department.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/96349873153.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_85dd06bd9dbc4ee49b6c322ec6437f08.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://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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 5272 bytes
SHA-256: 93c381b9a514d21ec5cc19820738943c55839fd423ef87c4ac5a9600d17f94d0
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 12120 bytes
SHA-256: e68aaf034f942a1457830f4d222af7a17a822b8317e6d7e526949db45f1cb104

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