Malicious PDF — malware analysis report

Static analysis result for SHA-256 198ce24e6a8faf38…

MALICIOUS

PDF

81.0 KB Created: 2021-05-11 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e9cb412347674cade40082fd39c99fee SHA-1: 7efa8db2710067a7c3e5a3e37402092ded6ade53 SHA-256: 198ce24e6a8faf385aa8a38e3ef7c9776286c8d62c5acccc1485f9ccbd104674
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and some redirecting to known malicious infrastructure. The heuristic 'SE_INVOICE_LURE' suggests a pretext for user interaction, likely to encourage clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=dometic+awning+motor+rebuild In PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/rigagikexenapu_rakepikesan.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/gdau1ji/67357666264.pdfIn PDF document text
    • https://cdn.sqhk.co/vokalater/gp0jhii/44016219504.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/zatawabere.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/gcjbrch/wyze_plug_alexa_server_is_unresponsive.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/jhnodie/6678144800.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/Bifjjhk/gibekesizazanobagove.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/complications_of_unsafe_abortion.pdfIn PDF document text
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/243298b21253.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/hrLid5C/xcraft_shark_tank_deal.pdfIn PDF document text
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/lizujunefiduvijupavu.pdfIn PDF document text
    • https://cdn.sqhk.co/xudapurofoz/c34jhgj/download_president_simulator_lite_mod_apk.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/samsung_model_rf267abrs_ice_maker.pdfIn PDF document text
    • https://wixapikolomuv.weebly.com/uploads/1/3/4/7/134746431/buzug.pdfIn PDF document text
    • https://pobipumobixox.weebly.com/uploads/1/3/1/0/131070364/sebekevox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/sekuwatizovibexalajixa.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_e5ae9b55c6234f0baadc59c04be55fb2.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_fb4db82a29c84a6ba9c7f4a86152ba96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cde6ed-fe2d-4072-be60-f0d023498f8f/3439610560.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_219ee11b973c4f81b749e407b1378bc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b70eef-6f66-41c9-94f6-73e23b933d2d/motorola_cp185_multi_unit_charger.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/bivulavepurudoxetokibubi.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_80f33a6932294deb98281fbb630b3f13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf45ae4b-67e3-46c7-a73d-dcc30c0a45d8/lorededexijekafujiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1de642b-a7f9-4269-9570-4372bd937a07/how_to_find_how_many_atoms_of_an_element_are_in_a_compound.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_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 5312 bytes
SHA-256: 24aa7e1804a9e7db23fbb7d0b0259e07d9750844165506e67856ed916ba7280b
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 10840 bytes
SHA-256: e8bdef1694a0498024c0a155e427a45bc2d3693d0868dc6195495e25f6c8bdb9