Malicious PDF — malware analysis report

Static analysis result for SHA-256 831e9427e21db6bb…

MALICIOUS

PDF

122.9 KB Created: 2021-03-16 13:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eaea6e2881a4a2162b126e5ca0927807 SHA-1: c25114ea2715315d53fe7497f85ee8d9a21b59ed SHA-256: 831e9427e21db6bb2827280ca902cb59210a90f514e9ec603a28ec152e56309f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://dugedepap.ru/wix?keyword=valley+ridge+elementary+clubs', appears to be part of an SEO manipulation or phishing scheme. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dugedepap.ru/wix?keyword=valley+ridge+elementary+clubs PDF link annotation
    • https://togijiwasifuva.weebly.com/uploads/1/3/1/3/131398416/9946344.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wijazozosobofedel.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/cyxjhwy/zezutemepivalu.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/wufofupubi_gigigolinoge_levuzok.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/finolunomaren.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/xevopoxasode.pdfIn PDF document text
    • http://xakavewazoxejef.22web.org/97284666576.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/iihibWj/cfo_job_description_small_business.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/wjjljhY/gatena.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/d6d7f31b-24e3-4ef6-b69e-12c9052ba3ad/18072296056.pdfIn PDF document text
    • http://vukelas.rf.gd/62675459836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d6458c-f881-4e16-ae3c-ce71348270e5/how_to_fix_keurig_coffee_maker_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d8890a-95c7-4a57-b2ff-c271d5feb6ce/books_on_becoming_a_happier_person.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_968ef26067ad4e50a151153d3aab2b1e.pdf?index=trueIn PDF document text
    • http://vapovalexuma.epizy.com/16635805608.pdfIn PDF document text
    • http://zijedan.atwebpages.com/bakovukepegonupuvigiz.pdfIn PDF document text
    • http://migusopugaj.epizy.com/historia_de_los_aditivos_para_concreto.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/97689237158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5320f945-90f5-4afb-b993-6d2d4f2d345c/bovekabo.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_fc0ad08f8e6a497b85a73fb90d16457b.pdf?index=trueIn PDF document text
    • http://pijufasadilisa.rf.gd/3859271639.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_b740a85b11894808859753353a3a4e72.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_e8428e6250584e9fb9f4ab351c41713e.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_3fe35f9708e247c5aa3bf400557c04bb.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000193d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D3 5240 bytes
SHA-256: 30b2fc877fdced6372db292b676c5aaca2cafe181656c8c79d6531fb82f0dfb2
font_01_sfnt_off0001a585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A585 11816 bytes
SHA-256: 8239df3b945a7cc47dfb27fc042e272259462251fb69a694b53ac356888cfc34
font_02_sfnt_off0001cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDBD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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