Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e130fd9c87ee02…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 17:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b25c02dd24418533b92cab25c2499589 SHA-1: 389a37dc4dde3ede70579ea382e0546ea008f102 SHA-256: b5e130fd9c87ee02c55c99cd5e99160c5abbe641ce46cb171a3533ef0c127243
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=bolero+music+sheet+pdf PDF link annotation
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/1751956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_602ae3500c78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_602abb541b693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_60417db3b4da5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_6006bb99b4c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_6039d77748a50.pdfIn PDF document text
    • http://sayfelengs.space/excelsior_springs_community_center_day_passk2vpq.pdfIn PDF document text
    • http://soldonlittleton.com/anastasia_soundtrack_broadway8z584.pdfIn PDF document text
    • http://lenudes.com/fourier_law_of_heat_conduction8wnmg.pdfIn PDF document text
    • https://lumakevapex.weebly.com/uploads/1/3/5/3/135311332/3153e66c81309b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fef0c79cb6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_605341c3ef30e.pdfIn PDF document text
    • http://itdiscount.pro/6990651274a585i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desavoz.epizy.com/wifawufururezib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ab6d10-d3d2-4f0a-8404-46e5beef80ea/brother_mfc_490cw_wifi_setup.pdfIn PDF document text
    • http://xopalotopobeda.rf.gd/vukidirewigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14482fdf-5e03-4643-b8cf-a5b690834215/google_digital_marketing_course_check_your_knowledge_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2c8fbb-7c94-44c2-b448-321484c8b960/how_to_change_battery_on_a_polaroid_camera.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_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 5232 bytes
SHA-256: f99d895c19d8504edf104079c9d53023cfc0932767045b281b4fc6ce5e5e677c
font_01_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 10940 bytes
SHA-256: 3ad66a6604ed031df20dbca75b2da1f0bd195b572abd41c7a0644af502cc7902

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