Malicious PDF — malware analysis report

Static analysis result for SHA-256 559c6d0bd87e5dd4…

MALICIOUS

PDF

72.0 KB Created: 2021-04-03 19:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a33adda5d4a0d1d7181175b3c2a3777d SHA-1: 8ba8aea298c500b89aa026ab74c1ed099a7ad856 SHA-256: 559c6d0bd87e5dd4babd4a9aef78a9d8b10508ede150069bb7f10ffde2767216
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/wix?keyword=family+brands+international+lenoir+city+tn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469128/normal_6033e25ce09e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_600143c123a60.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/skpgchc/bakovipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_6014756fe41bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd681a88811a.pdfIn PDF document text
    • https://cdn.sqhk.co/luxanimev/hhgew2Y/xodefujesogiro.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/Xjjhajc/draw_it_too_marvel_avengers.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/kinaposux-mexanatidod-betinim-rojoza.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/jfnhiji/rimimijamemexetobaxabixe.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/e42ipV2/94831902715.pdfIn PDF document text
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/gofadaguparoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/what_do_the_shining_twins_look_like_now.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/anime_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/81476634327.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_6700fac5aef34718a3f385befd63dd2d.pdf?index=trueIn PDF document text
    • https://5fb3b2f4-e86d-4029-b823-ac5950ddf4c1.filesusr.com/ugd/c0aa49_1222796306d64ace9e83d5e2e2712de6.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_fefdc1e6e3b7448295a3614fb037e74c.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_8ad5df201abf4f3a9e52cca0eb3ee0c0.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_97a22e430b2c4a049c3d31350cdb479d.pdf?index=trueIn PDF document text
    • https://506b1e36-fde4-4d44-8f84-dd746f9ef7cb.filesusr.com/ugd/e2f197_9ee154144e6e428a913e88f181acca4f.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_ec1be181370c44d693793ae5486e73c0.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_544e97bd093a40a4a4d41886308355d2.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_6b8dcec7199d4aafb13240b03c05d0f6.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 5280 bytes
SHA-256: df4f91ad494d1842960ef966361a6c20a62af3d74631f78cd5cb27a64f829996
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10516 bytes
SHA-256: 5fc0e423e4e68a1ab529b4cc0b8200dd7e9124302738aa0a8a6624a446b511c8