Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9171cadb59513c7…

MALICIOUS

PDF

99.3 KB Created: 2021-04-04 22:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3305de8fc233e052ad74f06943409005 SHA-1: 175b331a455a99e9269c357cf8843ed0d677408e SHA-256: b9171cadb59513c7090c556651cdacdf469460ced23e7accba924a5c96b37d65
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 0.9997

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://gimoguvi.ru/award?keyword=bayesian+belief+network+pdf PDF link annotation
    • https://vinaxana.weebly.com/uploads/1/3/4/7/134725794/0a9ac4a3b77.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/7b740.pdfIn PDF document text
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/2510874.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/sesogelomelowonokoli.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/tubusipelojolosipu.pdfIn PDF document text
    • https://maviwodoke.weebly.com/uploads/1/3/1/6/131606431/7713152.pdfIn PDF document text
    • https://sukurexu.weebly.com/uploads/1/3/0/9/130969838/kisenuxuj.pdfIn PDF document text
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/cb442.pdfIn PDF document text
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/suxufawapepowuro.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/1245179.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/worksheet_section_3-2_angles_and_parallel_lines_answer_key.pdfIn PDF document text
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/jifejef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokajejuti.atwebpages.com/lipid_metabolism_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738d9c1e-0e64-43ae-88c2-36bef77e2c25/gadavofajazoderal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e849eda4-82d8-4ff0-8ff6-b779b32d7dec/mupubisapo.pdfIn PDF document text
    • http://sinalowus.epizy.com/angular_6_simple_form_example.pdfIn PDF document text
    • http://gaxegumulot.rf.gd/duweponazefekafalogigozus.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 5480 bytes
SHA-256: 4a1687515ea1cfed43f0b0234768d1ca29e5abb6387e6ea197931320ef4e8692
font_01_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 13156 bytes
SHA-256: 34c623b1f0548481c6b21809fd3f18f36ca4724070fcb41a2423e67f6d4909ae
font_02_sfnt_off000168d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D8 16624 bytes
SHA-256: 9adf61ca482c95709caf9bdb932e34fd2eece40c67cc61f4dd80d062a7b03b8b

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