Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5264efe2d09a9d…

MALICIOUS

PDF

85.5 KB Created: 2021-03-25 01:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 94f8a02df664f1fa3c53987cd33cb25f SHA-1: bc5c3e9ec56c4984ac07e38fcac0bbc80d4946a2 SHA-256: 0b5264efe2d09a9d0f54b4963ce3c7ea4b80c19e9a4d667ede909a3371e0c4c9
196 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 part of an SEO link farm designed to redirect users to malicious sites. The primary redirector URL, 'https://golowaki.ru/strik?utm_term=r+programming+for+data+science+amazon', is identified as a phishing lure. ML and ClamAV heuristics strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=r+programming+for+data+science+amazon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5ff534a98ba74.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/7363156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_601affff8a11d.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/1c1165868b7.pdfIn PDF document text
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/pabanetava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_ad6c9b77b68b4de896ffc24d94992f85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/android_emulator_camera_upside_down.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/88399368926.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_e87efe6f0f2a4b12a1e3b198a12c7f58.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_ed78ed40715f4baf85da384d95f18e03.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_4eca6237c1ef4b179adc1e02e613af0f.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_60288fd5cb8c4fcaa6b0638c4f6ca637.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_1aeb3871d42d401790b7f0df17fa292b.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_973782e2b2e84da8be5792827c8a3acc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/hilot_wellness_massage_curriculum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/40342410173.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_19ebe8e6209c47159732a990fcbd6d29.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_1f7166b80d2040c18f347efc842dc7c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/how_to_become_a_vice_president.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/strong_mothers_strong_sons_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/bray_butterfly_valves.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_cacb4fa354d544a18084ade1ff3fcfd1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 3948 bytes
SHA-256: f751cef3dcdfcbe47d8daf9a8c222f3e861f4c2512231860cf9b8bf6b1d253af
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 5500 bytes
SHA-256: bbdd06ce87e418d662b715027a7c54791c40bc1e7e15f2d40cabac7617e0abef
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 11672 bytes
SHA-256: 4617642cddab9a6851e7896f150bb3494bee38252f26d08ff062d42591700575