Malicious PDF — malware analysis report

Static analysis result for SHA-256 524df15b40effa8e…

MALICIOUS

PDF

77.6 KB Created: 2021-05-04 07:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0464565295e863d38dc4f747234928eb SHA-1: 747f812199be7c73571b1a1f1b1b3c796baebef8 SHA-256: 524df15b40effa8e5f59734335ae5c2d6142e571244a392c99a098bc42e19e46
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://lozipotod.ru/strik?utm_term=how+to+use+my+hamilton+beach+breakfast+sandwich+maker PDF link annotation
    • http://sumomubidisuwo.iblogger.org/lakeket.pdfIn PDF document text
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/tekexoxomikagexeso.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/54908310883.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/circle_of_willis_anatomy.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/vokeriwepave.pdfIn PDF document text
    • http://sudakomazagupa.22web.org/84437430652.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/94362318159.pdfIn PDF document text
    • https://luweregovim.weebly.com/uploads/1/3/4/6/134661757/0a5ede5.pdfIn PDF document text
    • https://lorukadewe.weebly.com/uploads/1/3/4/3/134348028/9727aeb5326c.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/mowidigelefaxava.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/a5fc034.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/strona_bierna_angielski_wiczenia_wszystkie_czasy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_89e04d28199b48c98647b5de2c0ecf14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/362285e0-6974-4b81-afcc-393b3592db30/41660165222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e4da7e-5d19-443c-8c29-bbd5d1719616/2003_mercruiser_5.0_mpi_horsepower.pdfIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_1ecb2d8c4b714397ac94c1c6b483cd76.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/carburetor_circuits.pdfIn PDF document text
    • http://rivejekab.epizy.com/80705688596.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_4ef133ce4f0f4f81b695682b6dcb3ca7.pdf?index=trueIn PDF document text
    • http://dixabaxoji.epizy.com/26646813946.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_e8e199b7ea9f465e917371798ae180fa.pdf?index=trueIn PDF document text
    • http://likawunudonanep.epizy.com/m_audio_fast_track_driver_mac_os_x.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_1f03577bd1db4b0bb73f8cac965f4061.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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5620 bytes
SHA-256: 5439d4a7d083a176d3e1ab9184f7f2eabc166548bba8f00307e1180da0b6e10a
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 10700 bytes
SHA-256: c6193568a73d0824b154a46a273566ae596dd0344e2c17155747a601aa9c3dfb