Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35ede7e325af435…

MALICIOUS

PDF

73.3 KB Created: 2021-05-15 10:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 53d078dfa37c9161077ae636ff0f7a4d SHA-1: 0e1b725d480e8fb5e5aaa6663681f151ff373b55 SHA-256: f35ede7e325af435fbf55445bcc6437c1cef760eb83488931e80ed7526974e34
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, indicating it functions as a link farm. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=ruud+pe52-2+manual PDF link annotation
    • https://cdn.sqhk.co/jowapezo/FWZzlgc/witifenonid.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/ZLgeicQ/mefukijokowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_603440de10948.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/bankers_adda_december_current_affairs_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5fcbd6dc4cf8e.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/qFieggE/50958804573.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/kuzadaligerovigororimuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5fee91236f54c.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/j8jb7ic/58335241637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404730/normal_5ff69b72eaa40.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/YhfBdpF/street_chaser_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/Bhjugfe/uphill_highway_construction_road_building_simmons.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/qMANcji/95243191892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_b30f09382b284eddb462be0655ebad56.pdf?index=trueIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_b93f2c4f6d324862abe48c7671083a42.pdf?index=trueIn PDF document text
    • http://tosurok.myartsonline.com/asciidocfx_error.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_ab2438f091a74e1e8e5167d53811e90e.pdf?index=trueIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_096b698ee88e4410bc564082de0f91c3.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_55eda2ed820b46c7a293a5dee370ddb4.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_070bb4868d1f4c6798ba0e4ef044ab8c.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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 5128 bytes
SHA-256: 72ba9b8bce9e7fc9216afebd5ca55a58cb3331db3f690caaf01d2bb587f4297d
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 11124 bytes
SHA-256: 5835f7c66b39fb0f05cca3f3b69ee88856a412ef69a077dbcb2cf4cae978aca0

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