Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b271fda35d9c8b…

MALICIOUS

PDF

76.1 KB Created: 2021-01-02 22:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 81c722ab2df1db1d3805c867f39e5ede SHA-1: f7cd75e1b6068cb50f5f065ebdd19d0175a05af8 SHA-256: 44b271fda35d9c8b999b74288427e8d44f855fb6ed238ce646053374e3690ba4
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this intent. Although no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as Pdf.Phishing.Trojan point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=freezing+point+depression+formula+practice+problems In PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/b8365011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372753/normal_5fe0ba73ebcee.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/f0b0b1d2f3.pdfIn PDF document text
    • https://puneliten.weebly.com/uploads/1/3/4/0/134040782/jedozulevupa-gixubaxadiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd61d1eeaf97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5f97bbe12f2c3.pdfIn PDF document text
    • https://doxugibako.weebly.com/uploads/1/3/0/7/130776338/27bc5810f.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/gadumagabusodel/attitude_wallpaper_hd_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/chromecast_not_working_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/janafogoketurar.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/shark_bluetooth_speaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/64699356205.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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5620 bytes
SHA-256: 4576f819542887dd4c9f1b71af3a4a127b37d081404c2d7ad06ce64e66441bf2
font_02_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 11100 bytes
SHA-256: e97633a74dd029aaac3fa98f7e5106b3d2f4d09fe37cb61b08f623a2810e531f

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