Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac97f318554b0fe2…

MALICIOUS

PDF

81.6 KB Created: 2021-03-28 00:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 934f4e833f47456c66fc235a693d85a3 SHA-1: b2340ede2d2643b528dc902b1fe84902dc8ce972 SHA-256: ac97f318554b0fe29a43596a07f7f9e839c89769d51b42ba8ece7a63a410805e
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 0.9998

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://soxebez.ru/award?keyword=metaphysical+poetry+and+its+characteristics+pdf PDF link annotation
    • http://good-production11.site/anonymous_images_hdmfipx.pdfIn PDF document text
    • http://detonic-romania.website/mojovumotumosivinovumav4335.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/wanux-wuvonasa.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/lotutekorowule.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/be133784b41f.pdfIn PDF document text
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/2043393.pdfIn PDF document text
    • http://tonagruz.ru/leweruwuniwusofogd0kaw.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/1998588.pdfIn PDF document text
    • https://nuralizowipu.weebly.com/uploads/1/3/4/6/134693001/8031025.pdfIn PDF document text
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/pedabasafo-vigidagu-tebekakizewud-finar.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/cd3dcd56be4e8.pdfIn PDF document text
    • http://legejuwarowu.22web.org/gelong_thubten_guided_meditation.pdfIn PDF document text
    • http://zulojijimom.iblogger.org/17927021841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_6c97f75817c048c9a9ea4d156acc9374.pdf?index=trueIn PDF document text
    • http://fasevebozumip.rf.gd/49291170225.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_ef558d5a065a46b88c2336b4684c5ee7.pdf?index=trueIn PDF document text
    • http://nilakumofuxej.rf.gd/effects_of_international_migration.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_3628c80ebc704aff922ce7ae6eec6fcf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5352 bytes
SHA-256: c56be97cb4287559e80a448065c9892e2d9a95b109a2dae2d9b8dab936f5dad6
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 11380 bytes
SHA-256: 25c78aaf139304722f11543008b3b7c6170975b98ccc127fcf4c9706a6a5199c
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16164 bytes
SHA-256: 0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2

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