Malicious PDF — malware analysis report

Static analysis result for SHA-256 d427d8d54a7c4977…

MALICIOUS

PDF

85.4 KB Created: 2021-03-18 10:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3eeb0a8cb3a413fbc8da434433a4cdf3 SHA-1: 597d380bf90e94c56509d50d41cbcc22bc4f346c SHA-256: d427d8d54a7c497713ecd45149dff4bfb6447de020c1418073821ce52c7c3936
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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://maypoin.ru/wix?keyword=pokemon+go+bot+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492892/normal_6047aaa4bdc76.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/purovukanobogax.pdfIn PDF document text
    • https://kiradaropamun.weebly.com/uploads/1/3/1/0/131070158/bixebajuweneg.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/mabuvovaniv.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/sociological_approach_in_literary_criticism.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/sabupib.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/9431039.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/9759394.pdfIn PDF document text
    • https://julupoberoraw.weebly.com/uploads/1/3/4/3/134353221/1482cab5302ff7.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/megudakukesinaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fcae50569494.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/814dd75.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/fobupojowojon/81911748346.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/ferugut.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/blended_language_learning.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5040 bytes
SHA-256: e9ec4eb068aa195a3d6200537eedd2a9aa05ec79787bef84e9bc7cb0103c935e
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 11468 bytes
SHA-256: 9332da35c92d8daad6fdb107e9b582d764b223e67b8372fe1942ad49c4152760
font_03_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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