Malicious PDF — malware analysis report

Static analysis result for SHA-256 be76cd4bf0ab8e8f…

MALICIOUS

PDF

141.2 KB Created: 2021-01-04 16:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3cca42bf6b2d2cdd41284dce34cad798 SHA-1: 9b2b29b689eeb36cfce6ae9f3650495fe0ce78d3 SHA-256: be76cd4bf0ab8e8feff312a10751d24c3071c967001cbff78971ee5c8557d302
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9767

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://trafficel.ru/123?utm_term=thai+rice+farmer+hat PDF link annotation
    • https://rivixajonezil.weebly.com/uploads/1/3/1/4/131437445/e16b82.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/livuvapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd289c6d2196.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/914335.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/1QJQ9se/super_battle_road_resurrected_warriors_team.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5fbefd3d0ae3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/hc5jdPv/67110577497.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/sevaterog-jerok-konowevevolizer-gotukikap.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/vasakubidaf.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/xapefoputazin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/legenapi/character_traits_worksheet_for_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371e80cb-7f9d-4984-bcb2-3c3060bd40cb/13050451257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629b04a4-2a33-4aaf-90a2-dc4dd6d9fba0/zelulalilagazexivawanugit.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/latest_ielts_listening_practice_test_with_answers.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17873 4308 bytes
SHA-256: 568738ae8237ab2f61f47170693b6d37e1ea8484e719664e32b6209eec19af44
font_01_sfnt_off000187bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187BF 4860 bytes
SHA-256: f3f9359bc6033d7a7a7e7e72e2c50b311aee87a5c8c1d09e58f0dcbfaed29fdd
font_02_sfnt_off0001981c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1981C 4708 bytes
SHA-256: 9bafa8a1d1bfe4330a79b22cfadb8ac8b0b190e02584150d70ef05a465224fe8
font_03_sfnt_off0001a73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A73F 4436 bytes
SHA-256: 34112309a41f8ab5af0ced4a1894ba13b7c7f8f9f3ad8b34417abf8839524d4e
font_04_sfnt_off0001b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D0 8360 bytes
SHA-256: 8fc6ed1a108eefd47e4a1d0f3be7a718ac017ef6cb6090c80af9853b58de06fc
font_05_sfnt_off0001cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC03 17600 bytes
SHA-256: b101903a19dc6ea87ad0dce8797b1087bd84d35672b726bf7e0fe48a44dc6c3b
font_06_sfnt_off000200fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200FE 16368 bytes
SHA-256: 2ff33b427a0758d46f33d9e272059f5133f2b0d978eb103801bad4a8c3800e93
font_07_sfnt_off00021731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21731 4280 bytes
SHA-256: 2109f02eef208829a7f2397a4ac75c4e84c072e5ad39c302e934c18e068b944d

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