Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76315218a619a34…

MALICIOUS

PDF

74.7 KB Created: 2021-04-28 03:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bc84d65156c90ddc29ac0b5cfe2ac9a6 SHA-1: 2ab13b2a12a96059923efb9687695a5f3d493714 SHA-256: a76315218a619a344586fb87ede21d6140703fb6c64e3b9a8d4c21ab2f862fbe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to exploit users via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+to+write+a+introduction+paragraph+outline PDF link annotation
    • https://cdn.sqhk.co/dejuxafe/doiimjg/neretidibibagutakupome.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/upjeFrE/mofaxewakufitur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fcd05cede409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_60028a1086555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_c19adfde98b746019052b5902b56f6da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1adf2516-9402-4112-8375-79d2e7905422/70344810742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d08b22d-3e4b-49e4-b3ce-96f76d9df86e/gakemigekodibefexiloxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b7ee6a-cce4-440b-aaa2-d104177882d7/25656743761.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_c3791535fe4748a5bf5a8eaeefab5938.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab282340-06de-490f-9f46-d66ef197953c/hp_officejet_pro_8600_scan_to_email_error.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_32b9391c29544dceb2d9ba0b6d73e042.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_fbd65d00c9fb4455b1641374194b15db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7412db4-c905-478e-9a71-dd51243cca6c/suunto_ambit_replacement_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a46515-bc02-4fda-b6e6-c8af47bafb63/17461112183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92c6aaa-68b5-4e1c-8bc4-46a1464c7c32/chicco_liteway_stroller_travel_bag.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_e91f77bf59194d8d879e8decb9e70e67.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f056ebdf3b3f47e6b842ed8c2da88e2a.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_034fbbc6e0ec45cd8c5d0d415197850a.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_de6a66b86f724bf3a77dac207adacaa6.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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 5208 bytes
SHA-256: 93dab27188ebdf5599f48900c70b8de2881f3ef7880c42fd269fc7c5e89e5cb4
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 9788 bytes
SHA-256: e22f788256d035b39e9fa2f49f45ab96804e4f2ec7d57145c17fab7dcfa6b1e9