Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6204f6cd2d0c47…

MALICIOUS

PDF

77.2 KB Created: 2021-03-08 19:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b226689e192a478cb8c8fbd3a4a5f05 SHA-1: 18c81d0a1dc22a53e728780d4c35a01cbe069626 SHA-256: df6204f6cd2d0c4798ee0e43581702a82f695e9941ba25727547bff4d0778fc3
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 0.9991

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://gimoguvi.ru/award?keyword=auditorium+section+details+pdf PDF link annotation
    • https://rimapinazovifu.weebly.com/uploads/1/3/4/3/134341399/ninezakewa.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/jasawefufo.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/how_many_calories_in_a_krispy_kreme_original_glazed_doughnut.pdfIn PDF document text
    • https://vaguvijag.weebly.com/uploads/1/3/4/6/134610999/morawubovise.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/dell_precision_t1700_sff_desktop_computer.pdfIn PDF document text
    • https://juroluse.weebly.com/uploads/1/3/1/0/131071309/a1256dbb2.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/769bc02.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/divibezenafoxifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_2a9c46e7ead645e29ac2dc0863237c0c.pdf?index=trueIn PDF document text
    • http://safodur.epizy.com/who_died_13_reasons_why_drunk_driving.pdfIn PDF document text
    • http://fufezexu.epizy.com/litosipij.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3a82f5a60d6042e9b5e985e2bf3a67d8.pdf?index=trueIn PDF document text
    • http://xawatutosewo.epizy.com/75168979142.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_e629660ff1a64dfaa8b663b34d58606a.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_f35b9b5f9afc4cac80b833d0467f28b8.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_2bfd3d56272345e0a9830943145a38ac.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_c01c6148230b4cf38c02292982e61300.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_687f60c696ef4fcba81d018c1d9a270f.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_bc159d00817348bc930cc9ef45666e68.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ba7c9c246d2b4230b6608449f48d73ff.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_9cb328dddf1c4111a5e599d9e802f386.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_8265d2948d1a42509c6db4ddf89948b8.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_37aaf8df4fd74973b6bb34bc0e05ee74.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/gunapenuzi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 5288 bytes
SHA-256: 935e9c93090e3e4b0caca522afc921fb5b8af691e37ea2af179f92c0e95fb775
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 10408 bytes
SHA-256: e2cc8f4c4b86d1202cba9e502f0904276d1bc026433614d9eb31f90d7a2beeb3