Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea7bc8d51c48cf4…

MALICIOUS

PDF

83.0 KB Created: 2021-04-08 00:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d4412fb70103a934757616daedb0f0d7 SHA-1: 56852b1047424ecfbe36203fe0b64d1b433eadbb SHA-256: 3ea7bc8d51c48cf49de525b2ebd8ff54e4b3321d34dcc941d92d89d2a51543b7
156 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 0.9997

Heuristics 5

  • 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.
  • 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://xajibur.ru/wix?keyword=kingo+root+4.4+2+apk+download PDF link annotation
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/1768872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_604b99d1d5081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_6045093216e33.pdfIn PDF document text
    • https://dadikokaw.weebly.com/uploads/1/3/5/3/135347495/8b7b2a5005b96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ff4de1ab0bae.pdfIn PDF document text
    • http://volomowoxe.22web.org/74573096616.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/87446667264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451353/normal_5fc60249b1326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5ff6c5b390afa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fc68df4a0e03.pdfIn PDF document text
    • https://pozetegafikule.weebly.com/uploads/1/3/4/8/134857311/rosedolavujexevex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5fddd5248dd33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6040fca0d7c8c.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/a2d4d76c39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0b34bb-6d64-44cc-9a30-128b5193b907/2000_chevy_silverado_1500_ac_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb1509b-a754-4ead-b670-487238e38305/2008_dodge_grand_caravan_sxt_electrical_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a58b5da-eaf8-4a08-8c21-593d1bc3d33e/beats_solo_2_wireless_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8ae5d6-1917-4fe3-ad2a-509216663fdf/is_project_power_rated_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e201adfa-f203-4c14-9b1d-1faa02358a77/7098686289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1b665b-2fa5-4eb9-b2b1-776b141c481b/86255894692.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5324 bytes
SHA-256: ca5c605aafbb37694f3e7394bdf4182fdbf1af9f44a6c5458774681ebfd6b65a
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 11480 bytes
SHA-256: 4babb9a03295af2b5bb84852c45d9cb4d74c73a46aa973ff162dbaa12d7c3cf3
font_02_sfnt_off000129e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E4 16088 bytes
SHA-256: ba49a359edda73fb432b2118eee43e8681603f6c6f845ef214af08c3a95321db

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