Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d527d80cd0ae139…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 21:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 89fbc7fc62dc0097108ed5b6b61085ae SHA-1: 0d5012947dc7b24a8dc0bc1d07ebdfd608be31c4 SHA-256: 6d527d80cd0ae13961da06856ce399cf046e53e4161e5877e36b9c04be8a577a
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a significant number of external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=zoology+syllabus+for+bsc+1st+year+2020+pdf PDF link annotation
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/9824396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5fd39a080e5ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_604118a2af72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5ffe26a4993f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469374/normal_5ffd6d0e97e4d.pdfIn PDF document text
    • https://zuligenewem.weebly.com/uploads/1/3/4/7/134749141/zukolevelozibef.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/0dea8999c65a0.pdfIn PDF document text
    • http://checkyourcredit.info/785539007665w4rs.pdfIn PDF document text
    • http://cparta.moscow/escuela_de_psicologia_humanista_mexicoehhii.pdfIn PDF document text
    • http://sandwichhq.club/vogijetafogilagwmk2s.pdfIn PDF document text
    • http://detonic-ordina.website/adobe_after_effects_cs4_tutorial_for_beginnerss0fpz.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/letepazaveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_c6c6eb58458c4a7181bb8efd88646df7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b16a31-7882-4196-81af-2015c00e52e4/can_you_use_vinegar_to_clean_a_glass_stove_top.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_3e3f99e359674e3aa0f3416f48ec7fd0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6459694-5007-49da-bfd2-3cc44014976a/head_first_java_latest_edition_2018.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_f0fefe4be6d84a61a0f3d4441eda1d19.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_0d5e87c15e64421e81fef77f0c320bb0.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_e4ec1e6e371744c3be7a392455f9a67a.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_30adcad0cf2e461396f6b1dc4b6e9480.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c5e866-9cbd-4446-b788-72f39b2dba4e/57065559304.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_95fffd3f023c4e788efedb1bab267d8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4fc676-6d21-41a0-94f3-f171c7620820/how_do_you_replace_an_anode_rod_in_a_water_heater.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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 5848 bytes
SHA-256: 735428459bacdd717f3120d2b32d6bd53e569bdbe29c24a5d2cfa4436dae084a
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10692 bytes
SHA-256: 7d242e02fbc6b67a98cc6b6d19bfb2154455b7734b6b7b86c4b6c17da54b7bfd

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