Malicious PDF — malware analysis report

Static analysis result for SHA-256 5592f8b199b71152…

MALICIOUS

PDF

108.3 KB Created: 2021-02-08 15:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: da80a50410dd21090566ef9287dfb24e SHA-1: d5f99f1bd41ab43a9e5b3fbf299fa8ffa87f9acb SHA-256: 5592f8b199b711526c32ffb30c0b66d692f47fc5e141645ecb6557d16dcbad4d
156 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, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs, including one that appears to be a lure for 'orthographic view definition', point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://jacksth.ru/123?utm_term=orthographic+view+definition PDF link annotation
    • https://sazuwigigaxav.weebly.com/uploads/1/3/1/4/131407293/0470f89fe07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_601ddffa8375d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fe00e7a07c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdedea8100df.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/1240152.pdfIn PDF document text
    • http://nimolebefiv.22web.org/beauty_for_brokenness.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_6002eca39dc78.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/latijeb_nawujez_mowadatibidun_nijufadapibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_600e22b74fb27.pdfIn PDF document text
    • http://moperala.iblogger.org/fonezabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_60121b77287e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_601c8bf4578f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_6010737f9da58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/api_platform_enable_graphql.pdfIn PDF document text
    • http://zofagozarifo.rf.gd/88644898207.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/tegevozaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/coordinating_and_subordinating_conjunctions_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/voluntary_admission_to_psychiatric_hospital_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/rijamoneren.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/android_tablet_with_stylus_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/rujaxubasoxamupeneponol.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/admirvel_chip_novo_album.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B2 5388 bytes
SHA-256: 20a8ea67fe0f57990d503a957bffdfe4d53086d493c603b03ad772d2380503da
font_01_sfnt_off0001651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651A 12492 bytes
SHA-256: c8d8467bda4e17e44f8999060a1570539f78d9a5cd0e2268718963878c04a125
font_02_sfnt_off00018e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1E 16152 bytes
SHA-256: 2f6de30ea299fa16d672f35aad96fb26081650c2e515eb8c11c0d621c4885ee1

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