Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae267b8a97210a8…

MALICIOUS

PDF

80.5 KB Created: 2020-12-28 21:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8a0f872bad54793dcec295ee0c8004bf SHA-1: 863d55b35e16812369e9beb3292e5aae84af0a9e SHA-256: 8ae267b8a97210a8eafaf8dd19ea7aa0a7720ee03495f78b7183119988fa23c6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and disposable hosting services. This behavior is indicative of a link farm, likely used to distribute malicious content or phishing pages. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://traffine.ru/123?utm_term=okinawa+milk+tea+powder In PDF document text
    • https://cdn.sqhk.co/muvetowiripa/e0R3giu/12534500263.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/kavogev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fb5cd1c0d5f1.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/55ddff8889.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/UibAeha/22142603019.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/wiwikufasigisijutapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fa9ab885c45d.pdfIn PDF document text
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/tapumenopa_gipilubiz.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/2488720.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/b1bb92aa4.pdfIn PDF document text
    • https://midamexup.weebly.com/uploads/1/3/5/3/135314938/dulefipuf-xudedetemopas.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/QhjgHhg/9272860136.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hf4heja/phoenix_suns_girl_video.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/6954ea2c-4de1-41ce-b173-91f0c3c49d7a/muruvavokizububimawopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29431640-c32c-459f-9fe4-9dc4cc5c146f/ark_extinction_all_terminal_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7acb1bd-e295-4fd9-94b0-f1ed26ac0fb8/pukukogivap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 5112 bytes
SHA-256: 91e0797f9327ccbc73aae8a245a7355c4a20d5c88e1f6afb822bde76dd9cd327
font_01_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 11480 bytes
SHA-256: 14a2f57ef590185dcb0bc278db0788c7976a24d660013f5d27dd6935872ca769
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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