Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad510cc277966097…

MALICIOUS

PDF

77.8 KB Created: 2021-05-16 05:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 332cc3f0420d899974ccebef5d09f739 SHA-1: b179b5604c2ea76b7a71e67ccd4db427a25e4af9 SHA-256: ad510cc277966097460fbc73fd958229dde5bf899402bd387ca86a5a89337903
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms.

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.
  • 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://mezovuduw.ru/strik?utm_term=blackarch+sig+sauer+p238+iwb+hybrid+holster PDF link annotation
    • http://ryukzak.digital/que_son_los_signos_de_entonaciond5r2p.pdfIn PDF document text
    • https://likixulojuxe.weebly.com/uploads/1/3/4/3/134386003/fee5e146b95d875.pdfIn PDF document text
    • http://hookup681.site/pajisudinexanajolutivou6bw.pdfIn PDF document text
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/rurisenoselo.pdfIn PDF document text
    • https://sipedevete.weebly.com/uploads/1/3/1/4/131438766/2f78392.pdfIn PDF document text
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/5207437.pdfIn PDF document text
    • http://fsfsfd.xyz/hi_point_995_carbine_disassembly8wsmm.pdfIn PDF document text
    • https://kexofoxofoxo.weebly.com/uploads/1/3/5/3/135318322/saxeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_20c20aadd5404372878a6f6d1d6bcab0.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_2f0612cec5924dd687499bb907cdc019.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_17afc505f3734ac78246fc61186ef3fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dde931-5c35-4cdc-8f02-8f3a67c7b145/bd_intro_b_dressage_test_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad741f7-30a6-4a92-a254-f0b3dbfdeb55/cargill-macmillan_family_foundation.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_d36d1b6fd0d840069b6041d30c13c8d5.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_0b8850578c684773b8843374c03ac77e.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_7d200a58752a4bd0ac3471a6e5e3a131.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_cdfcfdf2206e4687bb68fff9ae50fc66.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_31ffb8d9b0db43cbba20f6da6568a578.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58626047-ae36-4e77-9bda-6a730768de64/84033595254.pdfIn PDF document text
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_14c1cc34a8624fa085dccfe0db3bd7d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b0c339-8285-4265-a6be-bbd8df9073ef/2nd_hand_university_books_for_sale.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_a197f735202840f2a112ab586d865200.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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 6272 bytes
SHA-256: 3b0fe77b96660f052f6c124cdef4288640ba0a8ab4fded5f864180c374be4275
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10564 bytes
SHA-256: c440e561d992dfcf0bf4452f229bb3fe3b8131499512bf0a0790ecb2882140c4

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