Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd58554c29b41413…

MALICIOUS

PDF

89.2 KB Created: 2021-03-04 09:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: dd426d95742a73a4928f7dab897eb703 SHA-1: 3bfc2f822b3fa51dec844552e1a9fa511639d11f SHA-256: bd58554c29b41413a2c5e9b5dc057bdf59920c494120eac78a1dcdfa9a768ccc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to external resources, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=transcription+and+translation+practice+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fe1b29abe8c7.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/iiC4iaT/bipanikinibuma.pdfIn PDF document text
    • https://cdn.sqhk.co/sokaxopoje/i4ggghA/jebuxumudemivotalunuwopow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_5fd6529e9395d.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ieTicoh/voferemagi.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/eoigicN/73946203286.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/4982254.pdfIn PDF document text
    • https://cdn.sqhk.co/xovijanovupu/QkNFxjg/maguni.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/jGjevib/87625024414.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/OiaMOie/starz_free_weekend_xfinity_2020.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://s3.amazonaws.com/wetowuzuxit/jizalipuretapom.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/20288456375.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/u_dictionary_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/template_blog_gratis_2018.pdfIn PDF document text
    • http://bupalim.atwebpages.com/avaya_1408d02a-003_user_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 5056 bytes
SHA-256: ac2cf5115ff5dc9e35c59d5d14a21924702c49a451d73f7d6b8c3c871d5ae77a
font_01_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 14192 bytes
SHA-256: 72156356b60024c8bfd3fc61a2d4de7918bd5bf1f3df694c496cfb0c4d4e3222
font_02_sfnt_off000146ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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