Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a9e8cd3344d807…

MALICIOUS

PDF

79.5 KB Created: 2021-02-27 00:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 260ca6cce27ef9f1e26bdee571764430 SHA-1: da2a7ed203866b28ca365f697527a24658e8a050 SHA-256: d6a9e8cd3344d80771d304b381de0806dbd48fce5a4d3abfd97d080fdd009ba4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/wix?keyword=foolproof+academy+answers+module+9 PDF link annotation
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/9233427.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/ff8a869.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/formic_aldehyde_uses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_600e133262365.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/noxelijubefobeponewusaz.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/5399a128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5fe2cbb73ca20.pdfIn PDF document text
    • http://xikupolabije.22web.org/pifewemetufe.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/how_to_open_lexus_es_350_trunk_with_key.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/wimapodumixesikapizokinek.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/kisagoz/18798385168.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/worlds_biggest_crossword_level_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/60544137369.pdfIn PDF document text
    • http://jumezasaguruwu.epizy.com/90097018637.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/sentence_correction_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/bricklaying_and_plastering_tools.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/tixawexojalogapufebogaso.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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 5608 bytes
SHA-256: 4c543419ecae151f472c9ee0e22494421039497ee728243f8fec606aebfb7445
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 2072 bytes
SHA-256: b6bd64fca1be6a2e8efd9a1b9013d937d1eaba26ac05d6b4b2a6e7cbd2265b51
font_02_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 10948 bytes
SHA-256: f337db533cc2ac7b1a45b5477a0a6dd2748ad796208b64c382cf8f74aae19abe

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