Malicious PDF — malware analysis report

Static analysis result for SHA-256 66885648c89482aa…

MALICIOUS

PDF

73.5 KB Created: 2021-02-16 13:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b195637c3051001e0232475e1219a47 SHA-1: b55d373395240e3c09c2b391b0a60a6cfcffff14 SHA-256: 66885648c89482aae9d4d5be89c6499fd929cc8e3a65241a18cd2475bee594b3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to lure the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+meaning+of+connectors+in+english+grammar In PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/gerefabijil-rulemutezixoru-muzivipadolozi-bopuma.pdfIn PDF document text
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/zafuse_xoxifi_fasik_valejefigabuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_60144e5fb85d1.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/kurorosisofare.pdfIn PDF document text
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/3220284.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/belle_princess_coloring_page.pdfIn PDF document text
    • http://arm-watch3.club/2463599089219xb9.pdfIn PDF document text
    • http://rodsfish.club/zimuzaluorh4.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/kubedukowug/85061338609.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/roblox_shirt_template_galaxy.pdfIn PDF document text
    • http://kikisitakas.rf.gd/uniform_cost_search_in_python.pdfIn PDF document text
    • http://suxukapuvajobe.epizy.com/acdsee_photo_editor_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/best_zodiac_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/play_store_app_jio_phone_keypad.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/manual_buick_enclave_2008_en_espaol.pdfIn PDF document text
    • http://tudigefogoxawu.rf.gd/always_bon_jovi_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/69758868641.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_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 5308 bytes
SHA-256: 55b920e21d7385480890e94290adc379c2fdb16a9cd637cff1d86e05f3e5ed24
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 11048 bytes
SHA-256: 1bcc0fcf997f6a22ecd148f287c764579795ff8085e99f9808d012b836fb0e46

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