Malicious PDF — malware analysis report

Static analysis result for SHA-256 67946bab4f823456…

MALICIOUS

PDF

104.9 KB Created: 2021-04-08 01:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a5ea3570df39d119997c3dfa13d1aefc SHA-1: 51683e0d3be9b877f44c813f93289d933adafc47 SHA-256: 67946bab4f823456b39fbaa034bd580bdccfbcca4fc955a99852786cec19944d
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the external links, https://resalured.ru/123?utm_term=el+inmortal+borges+pdf, is flagged as unknown reputation, suggesting a potential malicious redirection. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=el+inmortal+borges+pdf PDF link annotation
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/pebavo.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/679361.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/jutasisifap.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/gubule.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/82899075781.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/nizemuna.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/nakelozabo_wurasupo_meneretolepa_guxivi.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/guvovigo/bharat_movie_imdb.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/imf_myanmar_report.pdfIn PDF document text
    • http://kixatet.rf.gd/learn_cursive_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/xoliloxusudejijeguj.pdfIn PDF document text
    • http://gaguforijovu.epizy.com/online_to_word_converter_arabic_support.pdfIn PDF document text
    • http://betixaneja.rf.gd/61597922716.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/stress_management_worksheet_answers.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_94ebda709a214648b5ba17943c91e75d.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_35fb9f678f864d6d816295fce136c1b3.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_228d1b3d972f4583b947ee1cba5e637d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalasawu/ikariam_spy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/what_are_the_types_of_expository.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/vadodumubejamam.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_d120a8d34ec24417a63195aeaed1fe75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/conflict_resolution_lesson.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_ca52e11a8afc492faa492b7bbff0f948.pdf?index=trueIn PDF document text
    • http://pedulakumi.rf.gd/basella_rubra_linn.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_off00015bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC3 5460 bytes
SHA-256: fb26f98d97c8c45a6cf13b5974b96cffe55722fc8ae411efb12f5d2425725f99
font_01_sfnt_off00016e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E34 11464 bytes
SHA-256: d537c26e1020ec3088f8e6e89f95e47602df47b9de4874f57a5f394bde617657

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