Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f33db24e55bddfd…

MALICIOUS

PDF

75.9 KB Created: 2021-06-14 09:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fa0097ff639fba41778e9cae4e711f4f SHA-1: 2d3f19fa17c980e9caeec32869934d5eea5cfd53 SHA-256: 4f33db24e55bddfd337ee5806cfc57917e2199794590a9e981a6274c4039bd88
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/pbw?utm_term=divorce+settlement+offer+letter+samples PDF link annotation
    • https://wavogovarixu.weebly.com/uploads/1/3/1/3/131379914/9488668.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/kagabu.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/purilovupazu-mojajafepamep-zeropi.pdfIn PDF document text
    • https://lapobozitex.weebly.com/uploads/1/3/5/3/135305834/roleruviz.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4456121/normal_60b415e4901fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_6048281cdec19.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/nujidode.pdfIn PDF document text
    • https://xagiwejobumumok.weebly.com/uploads/1/3/6/0/136051235/tetak-likiteti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_602f1ca1ec183.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/famogasunim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5feeda0a7f8ee.pdfIn PDF document text
    • https://renalulawe.weebly.com/uploads/1/3/4/7/134735886/6283797.pdfIn PDF document text
    • https://tupalewituto.weebly.com/uploads/1/3/2/6/132682563/d06772e377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ralabasom.pbworks.com/w/file/fetch/145196406/witcher_3_how_to_get_wolf_school_gear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17006ef-2db0-46f3-846e-c06f69556171/sears_roebuck_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148a8117-4d83-493e-8e3f-27643d095211/acer_aspire_switch_10_windows_10_installieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09fa2fc-4594-4cc4-8a92-a309e6be3f50/fivotaxonupubufafovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fff050a-caa6-4724-abae-61326c08ac99/one_hundreds_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ffdfb4-df84-4a69-8e54-e19dc5bda801/learn_basic_electrical_engineering_for_diploma_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a36ed99-17c5-4d89-b56e-70d39c07a89a/32657945349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd10663-da22-4ab0-9e17-9b6244e696ca/26786988496.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/f/descargar_windows_7_ultimate_32_bits_iso_utorrent.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_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 5220 bytes
SHA-256: fb93234dea41c4db2d16bb0fa0856c6d5ac610961447a10f74b40ab695af6cc6
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 10564 bytes
SHA-256: 72015d1b19029799bf94bbfcc5a976a0db704869d523b6c8415ec295f9bd18d4