Malicious PDF — malware analysis report

Static analysis result for SHA-256 b616bebad515e752…

MALICIOUS

PDF

72.9 KB Created: 2021-06-12 07:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1034fc09fb43b990a6702a59cc953ac7 SHA-1: e79ef145752c6e7470c148f1e2961473fa883946 SHA-256: b616bebad515e752fa334af2ddbf7a886dd248fdaff0a614d97160b1398dac79
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to educational material ('12th business maths guide'). No scripts were extracted, but the PDF structure and heuristics strongly suggest it's part of a campaign to distribute further payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/pbw?utm_term=12th+business+maths+guide PDF link annotation
    • https://takazomidiki.weebly.com/uploads/1/3/4/4/134470224/76e244342bd26.pdfIn PDF document text
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/ff285190aa4991d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_6048a4abd30be.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/437e87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_604463d82abb5.pdfIn PDF document text
    • https://diwobubukabo.weebly.com/uploads/1/3/4/8/134875473/675c6.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/228090.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383149/normal_60b4859c84de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_6064c3142b2e6.pdfIn PDF document text
    • https://tatagufok.weebly.com/uploads/1/3/4/6/134692967/7429992.pdfIn PDF document text
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/e2c334ba71.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/1390225.pdfIn PDF document text
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/12d72c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_60c1ba8b1d0f1.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/acc15a27-cec8-4743-9918-92dcc8e5420e/molufusigapesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2554b71c-766e-4940-91c2-a65da3b05000/economic_growth_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade792a6-2c36-4b0c-a8b1-f677a023021a/how_many_sweet_potatoes_equal_1_pound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76e5917-771a-4ab5-86c9-7c023eb38cfe/timex_indiglo_watch_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddab4d43-e73e-4565-bf82-779de01d6841/what_are_the_duties_and_responsibilities_of_a_safety_officer.pdfIn PDF document text
    • http://xadobodit.pbworks.com/w/file/fetch/145103277/harivarasanam_yesudas_original_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bfe182-87c5-4e57-9916-a4e81a40cb57/bamibemevizopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c0579d-8054-4341-bf3a-8f89dd487758/3323023850.pdfIn PDF document text
    • http://xanovobuxebo.pbworks.com/w/file/fetch/144791064/the_escapists_2_crafting_list_german.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/is_the_kyocera_duraforce_pro_2_a_good_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f754e3a0-df6b-4781-8bd4-8a9b06568269/49629312636.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 5340 bytes
SHA-256: f3c6d7c42dabd4503ef3bb6704287d8e6f556aa81c4607cc73dc55deb2fb8824
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 10876 bytes
SHA-256: 7c8ad61a436d296cbba7ba08e08bfc0a5a7e1ed5391278110b8b462024110556

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