Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cada930b4c856c…

MALICIOUS

PDF

75.2 KB Created: 2021-06-14 02:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8be41700a2893b79cc625797bdb3ea14 SHA-1: e04674fa19a3843f0d6cb49563f564640ef1f86e SHA-256: 43cada930b4c856c1fe92e93378a484a5e8f36e9cbcc243881c2018881301025
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-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://pistant.ru/pbw?utm_term=grammar+worksheet+adverbs+of+frequency+pdf PDF link annotation
    • https://sajapomef.weebly.com/uploads/1/3/4/4/134402225/pefojuzigodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_600b62c6344a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_6054b67e2463d.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/aa2a27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_602ee2e54ce57.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/juwilotakulupib_nuvatuxuxo_gerolex_lesar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_6068e7c48b4c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1677094f-937e-47bd-9ce0-d4146f4ffc25/63142539305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2b8823-db9c-4caa-b755-96c981e77fa0/bt_notifier_app_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ce8915-357a-4bb8-970c-8f95f2a71ba7/balawo.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418959/poliboloduwewonarodunozon.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/69381669385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb54c4b3-121c-425d-9116-73686d9ba636/63157835962.pdfIn PDF document text
    • http://warikeku.pbworks.com/w/file/fetch/145271514/64756855155.pdfIn PDF document text
    • http://pebakix.pbworks.com/w/file/fetch/144755670/61564345430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0435ba92-fbcc-4dc6-bc18-9e45bab8ca4b/2303918634.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144989295/56039196869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788bc6a6-476a-4216-8270-5bb8bb2e5535/what_is_the_universal_theme_of_beowulf.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/derivadas_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2baca899-c9e0-4c02-b6e1-dd37e968d8a9/how_to_draw_phases_of_the_moon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09ab818-d0f1-4721-a6a1-6eadd7c727a3/wichita_county_district_court_records.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 5812 bytes
SHA-256: 04d5ff03a993410f8ca72ed59ca7d75ccc411eb69bcfe6b6e2f2ebf6891a8c5b
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10880 bytes
SHA-256: a696dee10c76192890c219ff6780f0ac760a4a7a92daeef77c1ccdc89e222f4e
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3