Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ecae8e51d1c64c…

MALICIOUS

PDF

76.9 KB Created: 2021-05-17 01:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4b2e5e2b8512800832b2337f6451da8a SHA-1: f820aac28cd1f21362f7274997eaab6baea2a7a0 SHA-256: 55ecae8e51d1c64c91b21c17caecc48da183694f139302087b777a41e4ce0749
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=the+grinch+who+stole+christmas+poem+feminist+criticism PDF link annotation
    • https://cdn.sqhk.co/dojidavos/bcJibMb/doubletree_hilton_hotel_burlington_vermont.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/aiivEge/52877633529.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/5jg6kfr/where_to_buy_freeze_dried_strawberries_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60483c227cede.pdfIn PDF document text
    • http://help-service-support.com/bemevanar2ap4a.pdfIn PDF document text
    • http://alifan.store/vtech_ds6671-3_dect_6.0_expandable_cordless_phone_with_bluetoothob5to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_606e11ca9dbcf.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/mowizojajomazem-nopetusax-lugakomebugus.pdfIn PDF document text
    • http://pitushok.fun/how_to_operate_a_rinnai_gas_heaterd8zly.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/hj4hfKn/neighbors_apple_tv_showing_up.pdfIn PDF document text
    • http://circus.market/soratoratopivajibowixongke5.pdfIn PDF document text
    • http://wtia.space/81217769159lvqvj.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/1855735.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/heW8yid/lutipegajazizulovunukex.pdfIn PDF document text
    • http://twobigs.space/template_cakrawala_pendidikan0irw0.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/42241437-4c49-40a9-816f-2d3eecb32f1a/11522812672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beec5100-449c-4db4-ab18-fc1b9579d8ad/homemade_micro_usb_to_hdmi_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8152c5be-0383-47f2-acaf-fd1670ab8d58/intel_sound_drivers_free_download_for_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eba98c9-f1fb-4488-b572-305ea22d0103/computer_programming_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9051b6-1a70-49b6-98b5-d6458ba8d02d/gebuvaxoreteromosu.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_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5468 bytes
SHA-256: 7af9187572b727e2fc62fe69534a177d516dfd38b60b2e36fe85b6e193f6277d
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 12208 bytes
SHA-256: a741dbc4230e7efc16c66fe56e0818565fccbfabff65b3fb7e578e95829f9ef4