Malicious PDF — malware analysis report

Static analysis result for SHA-256 474b1143be604016…

MALICIOUS

PDF

81.6 KB Created: 2021-05-15 13:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b3c8350c8de73a1ea7fda9d30ea94736 SHA-1: b403080ce7db165ad22e1dfa1d79ef7ae30bb9e7 SHA-256: 474b1143be604016f779943c8d9008fc3566ffaf48081f468368f38d633398b4
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://xajibur.ru/strik?utm_term=how+to+use+avon+skin+so+soft+bath+oil PDF link annotation
    • https://cdn.sqhk.co/wadusazilox/3PUgfhb/xaluxuvanoworolivuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/hOaTBhQ/79275775405.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/hgdWzXe/52855629619.pdfIn PDF document text
    • http://maletewidulebil.iblogger.org/probability_and_statistics_for_machine_learning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zazisuj.epizy.com/polixojelepobozugimeg.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/wokutinudibemo.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_1267f41b73c24174926aa550dd6d204c.pdf?index=trueIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_6ba7ebe60f96435994f7ba8a005b3cef.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_3c4b7a724c544e1ca8e0a3d6bf763089.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_2b1e58bd3e9941379e863c57e07f7b34.pdf?index=trueIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_f3854905040d431ab618d8907dbbc266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c040254a-d549-41ff-a976-288a4b58d6aa/the_alienist_netflix_season_2.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_3b921af8fec348a09a47dcbc5e03f770.pdf?index=trueIn PDF document text
    • http://monofapimuvazo.rf.gd/html_to_javascript_online.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_6a8f1d5f61bd431b8174d7411872bdc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fb53e8-5a87-4e9d-8193-db35b0a209fc/the_devil_wears_prada_movie_trailer.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_116ebde25709490ea60cf60893440650.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_3ff7c14dbb0c48fcb9de40cf3657d609.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_e45745ab0e7e4a9da569c89f5224bee1.pdf?index=trueIn PDF document text
    • http://xeroxuzowi.epizy.com/14447458950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82d2d34-8962-4125-a5fa-67a0d0be39df/what_are_the_duties_of_a_medical_lab_technician.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 4960 bytes
SHA-256: 9c888c072d19e8ba82e64b891f71b0b74b368f1296f7b423585cdf02f468950c
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 11028 bytes
SHA-256: e30978d47b802f08f2e40ebfaa32fdae11a37ef0d0aea86df3a2c6b16a993b8f
font_02_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f