Malicious PDF — malware analysis report

Static analysis result for SHA-256 9749d85a11411718…

MALICIOUS

PDF

90.0 KB Created: 2021-06-05 04:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fd92bf5c66714c7baff3ca99ec77fa82 SHA-1: 49c4a74c6dd1e1ad5800981ab5f8a1b5c06eae66 SHA-256: 9749d85a11411718111281e5f17c8030a20e473a43e03158d0abe6a01c69e402
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to host phishing content. The presence of embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly support this attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/pbw?utm_term=does+delta+allow+carry+on+bags PDF link annotation
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/xuwuz.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/wumizujesev.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/aa3cb1.pdfIn PDF document text
    • https://pogivigewe.weebly.com/uploads/1/3/1/4/131438874/1258659.pdfIn PDF document text
    • https://foramifetutimif.weebly.com/uploads/1/3/5/3/135347605/nukabutedexul.pdfIn PDF document text
    • https://susuravi.weebly.com/uploads/1/3/1/1/131164319/basatumibijak-xolekax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_605f9626f0afa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5fcef82d9b01d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_603a7b2f7abaf.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/dubikiteboze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5fc86c6b48e48.pdfIn PDF document text
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/serunifito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5ff4dd5f84667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_6023c0188022b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_6031bd327d158.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/68b8faa3-257c-4914-ab7f-313d12c2288c/how_do_i_change_my_greeting_on_my_panasonic_phone.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/bally_5000_plus_slot_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9c0f2e-ed6a-46c4-9164-4163dcea9b4f/what_type_of_comedy_is_oscar_wildes_play_the_importance_of_being_earnest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8068ae12-f3a2-4c1b-9fbb-3ef55de13a4b/64897012864.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413313/pokemon_go_spoofer_apk_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4837da-2ebd-4a4f-8623-98110ae87284/60995185882.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423336/80452781275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81455453-0056-4622-ba6f-21110e1aea1f/how_to_use_ps_gold_headset.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_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 5440 bytes
SHA-256: 5163d2f612337f8114a1fc16580bcc597c0f75b49e1d9be483e73fcb3757cf26
font_01_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 11728 bytes
SHA-256: ea671e083e8190e4b99dc3b198dc4a18b0d394f00a1741236356e1e14f7a8c1f