Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff775ab8f5a12cd…

MALICIOUS

PDF

67.4 KB Created: 2021-02-27 21:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05e0e37055d4caba617611510870e459 SHA-1: e8913163410e1a6738d9c2be52677d7647ea527d SHA-256: dff775ab8f5a12cd8be56326cb0768abf71a1b8f6589f92073b4094348947f36
156 Risk Score

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 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 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.
  • 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://resalured.ru/wix?keyword=running+to+stand+still+acoustic+chords PDF link annotation
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/d46a0454136.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/2799171.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/ximolomewuw_fazewafuwi_sumibizup_newuwunimafupez.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/9450755.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/topovusixupuxo_jatufiregoku_sugexanexedukaw_jesawujelemuvo.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/tikimoluvugu.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/factoring_difference_of_two_squares_worksheet.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/notipaxu.pdfIn PDF document text
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/d1a30c18e4a.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/rutufokedizon/big_sean_songs_2019.pdfIn PDF document text
    • http://telulepi.epizy.com/what_vegan_cheese_do_dominos_use.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/xorupuzufabifimi.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/xozugebowevoma.pdfIn PDF document text
    • http://rodujuvutadaxam.epizy.com/indeed_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/lamakupajegaro.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/gawagebexagagev.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/gumudomatadolog.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/ghd_professional_performance_hair_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/kesapegopiw.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/tedonubisupekemoxulonidix.pdfIn PDF document text
    • http://fujatelet.epizy.com/85370222842.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 5208 bytes
SHA-256: 8500f66830c75757be22465f3f1527e5944b25f28f19ab1100c5b3ce2c5160a1
font_01_sfnt_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 9968 bytes
SHA-256: 399a572dff3575cf9098c5aff606d7ee24804d3e607db5dee675912ec1d2e83f

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