Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc4c3ae5a724e45…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 14:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3f19c1e9634b6df5abe46bfb6b23609d SHA-1: fc264be54b07501a18aab9650a08a1b55c179f1f SHA-256: 4fc4c3ae5a724e454fe1756f4bcdbff13586af9b2d27b8bff7a11d434db0ec1b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm of external PDFs, with several hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 indicates a known malicious pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cdn.sqhk.co/zepipawetopi/gejbiib/programmable_light_switch_led_compatible.pdf In PDF document text
    • https://cdn.sqhk.co/ripowusaro/ggjiggz/cinchona_calisaya.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/g0ifd1i/90s_disco_mix.pdfIn PDF document text
    • http://bufovapafiwew.22web.org/clonezilla_guide_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5fed1dca3f52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_602a36f424f6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5ffce3ae2da8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fff5b56611ca.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/fupidig/pimepegadomuzev.pdfIn PDF document text
    • http://zumepelilebatu.22web.org/bear_cruzer_lite_pink.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=focusrite%20scarlett%2018i20%20drivers%20free%20downloadPDF link annotation
    • https://uploads.strikinglycdn.com/files/a87783c7-6fff-4c16-a1d1-183fcc96cf50/62111666161.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_272a9a88d0fd4e16b8272f4e992a0890.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/677bd145-ca42-4d43-b56a-801cb77c4bfd/dramatic_techniques_and_conventions_definition.pdfIn PDF document text
    • http://vubepet.epizy.com/gosase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079a19d3-4ba5-466e-b97f-c74f6d5349e0/5573931771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a664ac05-8e00-4114-9759-9c0823e42a3b/wacker_neuson_wp1550_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be23776-b4c1-4129-86cb-0cf5d87a2c14/panofegerogemobemuniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b1f275-7e70-42dd-8c23-b135daea8068/80363178097.pdfIn PDF document text
    • http://japusorusepex.rf.gd/bombas_hidraulicas_de_paletas_parker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c774459a-41e6-4f90-ba27-67ccd9eb9b45/jiraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a0c0a7-8447-465a-b515-1722fdd768c0/nederadusivawipesetewetof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7368a55c-c5d8-48b7-bb44-d52f7b21d988/kowulopaxiludajokejas.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_8a2dd82760f14a2ea2f4e2abd5eac20a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5524 bytes
SHA-256: fbbc965c71cb986fc3136efb4ab6124473abc86ab908b3f8c46156d1205c312b
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 11268 bytes
SHA-256: 022e55b53465c81521baf2c6deaaf29046c8d0280f9fb2230644598249f30e57
font_02_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c