Malicious PDF — malware analysis report

Static analysis result for SHA-256 300f17ebb741f536…

MALICIOUS

PDF

133.5 KB Created: 2021-04-04 12:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3679467708a3353d222515dd7b71f65 SHA-1: cd7e4f9340c3d7aa9264901729949f392c709d7b SHA-256: 300f17ebb741f53650f47af669a5db6768d61bb5789434ade246c7aed55cbc8c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://zajinet.ru/award?keyword=boolean+algebra+in+computer+pdf PDF link annotation
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/4d33238f149a766.pdfIn PDF document text
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/ad92bc6c20.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/authentic_assessment_in_language_teaching.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/kanuzepipixukorumoroxegub.pdfIn PDF document text
    • http://dommasters.site/how_to_connect_bose_soundtouch_20_to_iphone11cht.pdfIn PDF document text
    • http://rineset.xyz/751373827368ktaj.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/6400607.pdfIn PDF document text
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/02f6fa70af9.pdfIn PDF document text
    • http://ita-fitness.fun/5920158154872rcn.pdfIn PDF document text
    • http://vostokzapad.su/65847620078u0ipm.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/diablo_iii_eternal_collection_ps4_review.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/el_significado_de_las_artes_visuales.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/69928200958.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/bowuxa_fusowowox.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/descriptive_and_inferential_data_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugomodag.atwebpages.com/lamasor.pdfIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_4592a9e5e5d44a468f5593c00237eb2c.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_c83b2776af91456d8b403fabad42107b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8169100-83ce-4376-a8ba-1b47ed99b61e/27626470338.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_618e483943ef4d4abe22934eeaa078df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73aaaf36-b98a-411b-a1e8-e345ce8b7fb9/pogubuxiwugetasadizife.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_b91c0d0461384ed5b44e43ccf3c76b58.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B222 5488 bytes
SHA-256: 6b7a2b1a2a79de1a2aa249daa102606bf1962f0354ea9c6c5f52d8d7bc089170
font_01_sfnt_off0001c4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4B7 13440 bytes
SHA-256: 0169c0d2542c43be1d502f827129a451cb6813a5c4cd71467ead86eace9ddf5d
font_02_sfnt_off0001f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1A8 16592 bytes
SHA-256: 325d3f986266b3936b52479b1d0614f78b52c99fd7be34c9bc0b075099d8db31