Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af18bed21c0e089…

MALICIOUS

PDF

114.9 KB Created: 2021-04-07 15:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 811fc4a3ea5af54b271921771c19141f SHA-1: 599b112589c048ff92dbe1a695207f9c350a71ff SHA-256: 3af18bed21c0e089ec05b0e8ccea627a07a756d1c9671d9b3c8ae7c9fcb9eb11
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content. The document body, though heavily obfuscated, suggests a lure related to corporate templates. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=corporate+minute+book+template+ontario
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/cfde060605.pdf
    • https://cdn.sqhk.co/sojuzafu/fdw6ijn/mermaid_picture_frame_hobby_lobby.pdf
    • https://cdn.sqhk.co/jawutuwek/Zhhh05D/guzowotegobufe.pdf
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/rugunizekirako_dawavoxedosex.pdf
    • https://cdn.sqhk.co/litigoruf/eqigqH6/kibelakoziwefupifeduxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_7bab014c35e14372a1e6cf3b52a462ff.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_a4c94c24e1ea4ffcaa2167a19660c9fa.pdf?index=true
    • https://s3.amazonaws.com/sezebepit/abdominal_examination_steps.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_ef295b25b5c845e99059f1865d15be26.pdf?index=true
    • https://s3.amazonaws.com/tokit/89023693161.pdf
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_2d96f8055c29439d981b2388cb55c856.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a508e011-3885-46b2-8730-ec580b8c6716/desibujubaguviniwe.pdf
    • https://uploads.strikinglycdn.com/files/52acc196-23a9-4600-851d-3dc1f3f6c771/dasomawusamazejas.pdf
    • https://uploads.strikinglycdn.com/files/18173480-6e5f-487e-9813-310b4c0abe08/pamaruripiguzepek.pdf
    • https://uploads.strikinglycdn.com/files/8997ae73-adda-4fee-bdbe-e15267775308/keurig_2.0_k350_manual.pdf
    • https://s3.amazonaws.com/kelukakeb/mazos.pdf
    • https://uploads.strikinglycdn.com/files/5cd62148-3755-49f5-a936-35479755b240/2268006126.pdf
    • https://uploads.strikinglycdn.com/files/458cafed-1708-4814-87e4-bb9f1401130b/ms_excel_2016_formulas_with_examples_free_download_in_hindi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001806c.bin
b086b9a0187298aae3bfb5c78fd47592316e3b1c7e8c6234f0ee6bf0fe330909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1806C 4896 bytes
font_01_sfnt_off000190f5.bin
33972a71d2cdcbd996c85682f6be7e1d1572a3312ad8a983dc1a291f869d95ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190F5 14024 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.