Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee713fa611a3d818…

MALICIOUS

PDF

80.5 KB Created: 2021-05-30 07:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa1cc00a2647bc291d183240ed66bbe8 SHA-1: 2053a8143862d037aaf2065d3eba28ec97f1a750 SHA-256: ee713fa611a3d818348e6bde90c63939070da8256a50bb6f301863afadddb827
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. The embedded document body, though heavily obfuscated, contains references to doll values and wkhtmltopdf, potentially serving as a lure for unsuspecting users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=do+madame+alexander+dolls+have+any+value PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403141/normal_60616fe0991dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_603e932129f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd718f22b780.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/c82d028bd5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_600b62096069d.pdfIn PDF document text
    • https://letimetijomez.weebly.com/uploads/1/3/1/4/131454560/3dadc9df59ce.pdfIn PDF document text
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/mukipawuk.pdfIn PDF document text
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/e00ab.pdfIn PDF document text
    • https://jifabipesetumef.weebly.com/uploads/1/3/4/8/134896168/7421081.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/jedawamumaboxusu.pdfIn PDF document text
    • https://forupubo.weebly.com/uploads/1/3/4/6/134689325/buruw-ganoxafinigixu-boliroki.pdfIn PDF document text
    • https://lepuxodotedob.weebly.com/uploads/1/3/4/5/134507089/9448f5d.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/2298029.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/515656.pdfIn PDF document text
    • https://ladozazewuse.weebly.com/uploads/1/3/4/0/134095850/jegeridu-tiwepila-zolerukataja-jatipesorevevo.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/e8d497b2-2dc6-43df-b310-2357ec0a68de/kirkland_signature_hearing_aids_9.0_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd8baae-aa44-451b-931a-8de42f8ca54a/fun_poetry_writing_activities_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b5b555-c589-4824-9a15-8bda8a30f587/66384891139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90771ac7-2d4c-4ae8-8f64-92145de565a5/what_does_maintenance_required_light_mean_on_toyota_avalon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aec3abb-ec09-4feb-99e1-64fcf92ff703/carreras_que_ofrece_la_universidad_de_toronto_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdcef54-698d-4cee-8e1b-08f73f5c27bd/telugu_bible_quiz_app_download.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_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 5296 bytes
SHA-256: a22558a7d270c9e189d0d8a35b292c747e22ea17eed37d4c06eccebb9137291c
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 11080 bytes
SHA-256: 58589fae9354040f82faa9255db7d43637dfd70a65f5b32a0f94564f7a907aeb