Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad5771d53a28814…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 23:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2c35610ff3b5744ffb23e21a47b8fedd SHA-1: cf2084a3507f92219a5de6f628d662f0650dc371 SHA-256: 8ad5771d53a288147cf51e85d3c34e8e2adb30042bf80e1a89e444d953abebe5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or engage in phishing through these linked documents. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=gravity+falls+memes+wattpad PDF link annotation
    • https://toxovapuwelubu.weebly.com/uploads/1/3/4/7/134733969/a439ce119552f.pdfIn PDF document text
    • https://fixojifuxupelo.weebly.com/uploads/1/3/0/8/130814076/37ca8f86fed.pdfIn PDF document text
    • http://revivinof.iblogger.org/naminoledabopar.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/kinopip.pdfIn PDF document text
    • https://bisijonowazupu.weebly.com/uploads/1/3/2/6/132682684/sixegebab.pdfIn PDF document text
    • http://jotepuxigavof.iblogger.org/zekofexodabaxolaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_600e8ec62809d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501514/normal_5fcb70b873023.pdfIn PDF document text
    • https://fobaxidoxeg.weebly.com/uploads/1/3/4/3/134356333/3556725.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/gekenejores.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/lajumabudadonula.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/685939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387060/normal_5fef0f07bebb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_60010992e72c3.pdfIn PDF document text
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/sebotonikodesogafa.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/bca988265d243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fe298eb50998.pdfIn PDF document text
    • https://guxiwejibu.weebly.com/uploads/1/3/4/9/134902351/vifipomefipok-digibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozobavotij.epizy.com/60168150126.pdfIn PDF document text
    • http://jupasugego.rf.gd/narijij.pdfIn PDF document text
    • http://muwovupa.epizy.com/vutug.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 5472 bytes
SHA-256: 9aa7e0db63b872a1af0d1f5bbe89376676e893834654424d7c1d39b5e0aff46b
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10520 bytes
SHA-256: 10bc9a72e5500b4cc3364cc32a72e7de63799c62362c099f2d8556fb5e9b07f9

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