Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a8a82fe139b639…

MALICIOUS

PDF

97.1 KB Created: 2021-05-23 13:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a2c802935bc8b41c464aad35405840f SHA-1: cf333d2289c608d3b24e2dae343daff890bd4b12 SHA-256: a7a8a82fe139b63961559189029bc40cc0b58066f8a5c9081434f8b273c16cf3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=round+midnight+pdf+bb PDF link annotation
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/punejalasifinovijuk.pdfIn PDF document text
    • https://damelexivukek.weebly.com/uploads/1/3/4/7/134771288/novinoxisumek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_6002a50da30f1.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/musegujufoz.pdfIn PDF document text
    • https://wobajaxeme.weebly.com/uploads/1/3/4/3/134350369/03f9912bda0ac3.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/tobije.pdfIn PDF document text
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/4a58428.pdfIn PDF document text
    • https://sibanomo.weebly.com/uploads/1/3/0/9/130969588/3245795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fdbc0da3fa12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_604b98436a658.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/9104eca8949f3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fd9dba23440b.pdfIn PDF document text
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/nijanizavoxuzefudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411511/normal_60020453e2eb8.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/b5a48fe60aa7cc4.pdfIn PDF document text
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/5988927a0276.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/tekimasofujuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4f72fdba-2d12-4e81-8e55-cbc4d5887212/93616549950.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/mapegaxubofakisamud.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/jogefunerilurujeseba.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/logitech_wireless_headset_h800_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78446124-5147-4d8b-a95c-5ccc286cb817/outdoor_first_aid_kit_contents_list.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 4848 bytes
SHA-256: b206e339d5869857bae606b2e6f3984eff32812a764d754ed06da800360c2ab3
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 24716 bytes
SHA-256: b885e33eb7b0ad744b33822c372fef43cc2dce9935d5c3f641ef6586bf98a064
font_02_sfnt_off00015136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15136 16728 bytes
SHA-256: 9bbeccf79cc3ac05933108b6473e9faa83f4e46598fc6cd77bd4b388ab08fe15
font_03_sfnt_off00016885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16885 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3