Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d724fa4e133ec3…

MALICIOUS

PDF

81.5 KB Created: 2021-04-10 01:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5d61db0d16c474efb43ed03de6bf73f SHA-1: ca8a3d37380080d2febe5fdad834d9b3459f80b6 SHA-256: 93d724fa4e133ec3d1b2c834638907605bc4d022fd8caa606119f1a23d8bc62c
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 0.9997

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://xajibur.ru/strik?utm_term=how+to+connect+a+hp+deskjet+2622+to+wifi PDF link annotation
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/pisarowux.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/90596837327.pdfIn PDF document text
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/kotij.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/rilidolisodovuxetew.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/boduvanineliguf-jazofegid-gijavinuwom-zawalavasa.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/rimakun_gajofumifemas_dowakejitug.pdfIn PDF document text
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/139408.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/smd_capacitor_codes.pdfIn PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/2509cffea55.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/a97ee0.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/3489256.pdfIn PDF document text
    • https://wawotuxela.weebly.com/uploads/1/3/4/3/134352856/5162814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_56a3f70b256a48bcae52b2a87b2b99f7.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_2b8ba4b07b1342eeb40261263b30efb7.pdf?index=trueIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/zadirurekulumazubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46cf2b0-789e-4de8-888e-de938eb563ed/pabigizadigatisijisakozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30da091d-74ce-4563-968e-389affb61cdb/34238080665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a4a1a7-7870-4888-a212-0a9aa78186a6/kufekofole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de05069b-3c11-4dbc-93c6-ee02dbae1367/how_to_stop_a_pimple_from_scarring_after_popping_it.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_63e69151f03d4db2923ee3f75e33812e.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_f4160bce435140ddafa89374374b4268.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff041bef-169b-4c2a-ad2b-605e5dafbff1/shakespeare_sonnet_116.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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 5596 bytes
SHA-256: c392f090a40ed3c4f23fb4f2be2280feee4fcdbdff58b022978339c0a3c2b064
font_01_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 10872 bytes
SHA-256: dfa30fa8257af153ed32d09b9c1de519501ca2d858e17a330e9fe0a428eb0a55