Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae78ca4177706b0d…

MALICIOUS

PDF

86.3 KB Created: 2021-03-17 16:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc23c2e6a68fe1429d0c9590c57b667b SHA-1: b4f7c748b5eca7b72233e93adeb8dda5e09504f3 SHA-256: ae78ca4177706b0d9437f38f819102cae8f55a4f4928532a9b3c3f4b03e6a0ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links to various domains, many of which are hosted on disposable or suspicious platforms. This behavior is indicative of a link farm designed to redirect users to potentially malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=izaro+poe+guide PDF link annotation
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/9993675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ff97a0b7c3bf.pdfIn PDF document text
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/7564996.pdfIn PDF document text
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/495583.pdfIn PDF document text
    • http://piwubexugapi.22web.org/rhetorical_analysis_essay_ap_language_and_composition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5ff3d583d3114.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/vevefuzu.pdfIn PDF document text
    • https://zotapuzuvekef.weebly.com/uploads/1/3/4/3/134323554/3079699.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/a7cc1a863c71.pdfIn PDF document text
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/bogafonulij.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/litak.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/tibixafedu.pdfIn PDF document text
    • http://vosalax.22web.org/21092106362.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/6be253d.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/0a765d895395af9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolumer.rf.gd/rimigadaliditewel.pdfIn PDF document text
    • http://waroxudon.epizy.com/faxojulu.pdfIn PDF document text
    • http://gabigirinekib.rf.gd/dijilekuziv.pdfIn PDF document text
    • http://gogozibopuxut.epizy.com/indore_master_plan_2020.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_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 4904 bytes
SHA-256: 3051e2a1d744db5f1c37f673ea3f9ac979b6927e33075345097017d0741a6f10
font_01_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 11120 bytes
SHA-256: c989588a456661356f0708701de25962b3cc7c313b0583a6f1720abf1ba911a5

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