Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bde7f0d2630628…

MALICIOUS

PDF

41.0 KB Created: 2020-10-19 11:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b62491d067d73da2c29fdd97f8c2e280 SHA-1: e2674320a9e02e3b5041d9f8f22a46c80b6d3d98 SHA-256: 22bde7f0d2630628fa1423d579a0333d1f4a7992e55b32eaa4b19c127d460799
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains numerous links, many pointing to disposable hosting services and a known malicious redirector. The document's content, though obfuscated, includes a URL that appears to be a lure for 'polycom studio installation guide', suggesting a social engineering pretext. The presence of a remote-support tool lure heuristic further indicates an attempt to trick the user into executing potentially harmful actions.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://ggtraff.ru/123?keyword=polycom+studio+installation+guide In PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/01b94de2df0ca7b.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/migajavapumumo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/c0c720d6032.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/5509582.pdfIn PDF document text
    • https://gowiwoniba.weebly.com/uploads/1/3/1/8/131857243/godebisewolasexisavu.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/5756966.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/povevoravorixifeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f89322204b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f875a4a185f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f87b0e2ce286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f8cc418ac08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8d1bfd363eb.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/devipev-nozijimigute.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/mirixexeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7faeac-2c65-403d-9169-a1787c8620a2/zigutifodiliwaviraminu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45567850-43c1-434e-a2c7-6a73a5fe786f/38311259374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb444361-b0d2-4d01-bf62-0c98ddca00d3/29700700764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798a9abd-5eee-4dbf-8bfd-ecc2dae58d2d/10017827508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ce20e6-1996-4d43-ac4e-6778cd2df0fc/95851732267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06cb35d-f714-4a1d-ae83-4704e73e999c/40797763783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a37dbc-fda1-4d40-94fa-28cffe5d24ee/mofapebelos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 5268 bytes
SHA-256: 4820d8cc2874395871badcdc80500c13bfda9d49e4c515e8e567f1d0482e6d5a
font_01_sfnt_off000071bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BF 10760 bytes
SHA-256: 0952b01f6887aec479079c980aa36d68700ddf4d606477153c5441a947356186

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