Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a06ac9c9410732…

MALICIOUS

PDF

67.8 KB Created: 2021-03-04 21:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 099f56ef6daf6022227052125ad3bec9 SHA-1: 8a2da1ba9b383d19ce7add54766eebe9cec6bc0b SHA-256: c8a06ac9c941073283640be099a5e1ee9d39fcc5576a1263002c85c94b1cceaa
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 hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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/wix?keyword=ap+computer+science+magpie+lab+answers PDF link annotation
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/repibodutuv.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/9990029.pdfIn PDF document text
    • https://mozofejetexutik.weebly.com/uploads/1/3/6/0/136051344/6022461.pdfIn PDF document text
    • http://ihsteam.ru/who_moved_my_cheese_summaryp1t0n.pdfIn PDF document text
    • https://kojelujozifani.weebly.com/uploads/1/3/1/8/131856125/vetezemuset-sofitimegidej.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/4430325.pdfIn PDF document text
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/vafaledup-kidago-tepudoxifu.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/b1259e.pdfIn PDF document text
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/fujogulewe.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/samivirajovewodikego.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/8697c352-2a71-4489-896e-03117f9db154/manual_testing_interview_questions_and_answers_for_experienced_in_tcs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0e9bc4-5352-4c05-abe8-5d513f814f16/modern_world_history_patterns_of_interaction_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461314aa-23ba-439c-9303-f03c56e83d97/wheel_of_time_series_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910a8fca-0a49-40eb-9ff6-08fd2a0b96b2/hitachi_nr90gc2_troubleshooting.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_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 5476 bytes
SHA-256: b45102d2e7fa81b8e546f0ff787bf67dc3d2a823545e8f7d6b2c8cc91c5e3804
font_01_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 10016 bytes
SHA-256: 10b3b9fd0bb1dfd283d06218bdb09ddea87428d133832fa0f5ac88509cc30955

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