Malicious PDF — malware analysis report

Static analysis result for SHA-256 7044a7bb842213d7…

MALICIOUS

PDF

85.9 KB Created: 2021-04-22 06:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0b57efc9b2fb32ed328a3d9ac3398492 SHA-1: ca4737f0e9f72155cbe4be9ca724046f33c280df SHA-256: 7044a7bb842213d72cd990516db8a6403a876e39a60daf0ffe5cbb14493c95ac
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 functions as a link farm, containing numerous external URIs, with a primary suspicious URL pointing to zajinet.ru. The document's structure and the presence of multiple links suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=tl-wr841n+manual+pdf+espa%25C3%25B1ol PDF link annotation
    • http://xufededubumavif.scienceontheweb.net/how_to_clean_bionaire_heater.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/neet_2020_answer_key_aakash.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/7f5df018-572f-423d-9bbc-a392425e5343/gunulowikisabikafatomasuz.pdfIn PDF document text
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_e7e015b93b964e88bb6485ac83118bed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a2fdfd-8c71-4a47-a6cd-fd3bb4f09272/samsung_tv_remote_control_instructions.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_f858b56afede468aa8b1bd9d7de01740.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2600a0c6-60d8-4219-ac99-015445c9e1eb/xitixejofekat.pdfIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_7d53da777f0240069252b474947ba766.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2b851c-1d8b-4476-88ab-b8dcf23e039b/nikon_d40x_price_in_nigeria.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_85a9e47589d04ea2821c955968694fb1.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_273ca50c6c53424a8d104a7aaa5c0626.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e55bd12-db1f-490c-818c-f2ec272ed07c/best_way_to_learn_financial_modeling_wso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594e28ea-ff38-4904-ae68-381fb918aa77/lukel.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_5819959e0ca74754904199e71470bc81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4aeb3f-6a60-413f-900e-c02925a5c302/15109857946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09bcb47-d383-4740-964d-cad652938d7a/vatorojiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a7649e-567b-4490-82d4-62b65f98a771/kigawimuxozafafan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2323170d-86d5-473b-b7ff-68f88c998f24/gitel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed62e075-f710-45d3-9935-dc15a419241c/would_you_rather_game_questions_funny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20dea354-867f-43c6-9203-1eaf8ce36ade/batawesewasik.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_a0a42e158e5049b3bef77a708f5b8f28.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_f0957f5797b14905aaa83a3564c69621.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_521717ea38794b1baa1d9ab1a7cb59de.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 5808 bytes
SHA-256: 556a5aec53670c4042c547ef2bb14f8fb2ea20595c8b56e1125df28273814fc2
font_01_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 15308 bytes
SHA-256: 16e4a0c1cf6b814dfc56a287b4e4c229aff162f187208a2d6f1f683541a19dca

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