Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a059e919afe561…

MALICIOUS

PDF

77.5 KB Created: 2021-04-07 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 100375b96f76a77e354e4a783e7b24e9 SHA-1: dafd71173d9d3b555f6ba8aac69d5d0f7a4b60f0 SHA-256: 78a059e919afe5615644890cd04b3d90c12a783d00b0e95253b5cca3654e22f4
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 0.9990

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://zajinet.ru/123?utm_term=extra+wide+shoes+size+guide PDF link annotation
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/152213.pdfIn PDF document text
    • https://xavivovumerut.weebly.com/uploads/1/3/2/7/132741007/bikisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5ffbf93028fbe.pdfIn PDF document text
    • http://ca-manalapan.space/they_say_i_say_4th_edition_full_book1stwp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5ffb206f88fa6.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/bogazekezaz_zijileruxam.pdfIn PDF document text
    • https://depovazopalixu.weebly.com/uploads/1/3/2/6/132681382/wutob.pdfIn PDF document text
    • http://kernig.online/hayward_pool_heat_pump_error_codesacbou.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_605b593370047.pdfIn PDF document text
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/nawudewiwosedupow.pdfIn PDF document text
    • http://3bki.ru/60849194220a6kxd.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/2e2a6576211c258.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/tetijigujuli-futapevonozupim.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/68707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5fe2f53942322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_6006d55b05df3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5ff150a676c8e.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/warefud-verib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_6056b10a9dba2.pdfIn PDF document text
    • http://com-signto6.xyz/892437662535ns8i.pdfIn PDF document text
    • https://madigapelodawip.weebly.com/uploads/1/3/4/8/134846312/5780767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_99419bdff74a4f89aa99e6ae44c516a5.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_918c16d8a1024c5a81a2da0cd61d090f.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_615676a84ec34656a481afc7016ca1c5.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_c74af4c364e74ecfa8f8dd5ac6ea2d5d.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_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 5220 bytes
SHA-256: 1a841135cbbd3eb5674731d7464d00a94a73a71ea835c632aac0ccd8a437b249
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 10472 bytes
SHA-256: b94f0ab61cbcacdb1397d015a91ec4a6b8d92531c7f47030bc1a89d64b6f5bd2