Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa1bf050b183347…

MALICIOUS

PDF

68.6 KB Created: 2021-04-03 22:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e166d4c00dc9992b3528db5ef734192 SHA-1: d692a563991a45873628deb587652e45774af256 SHA-256: 5aa1bf050b18334702fe23a4c9e7c89a47d8bbaf2c2b1011ea6b199301672bd1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of embedded links, suggesting an attempt to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=cardboard+sheets+for+sale+philippines
    • http://kavelokafozi.medianewsonline.com/how_to_reset_epson_l360_waste_ink_pad.pdf
    • http://xenojupu.mywebcommunity.org/epilepsy_treatment_guidelines_2020.pdf
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/molekeronuzijud_guvagugejofigid_pijixi_jinapomitu.pdf
    • http://lurubalopare.sportsontheweb.net/riesgo_relativo_y_razon_de_momios.pdf
    • http://mukumirulaf.22web.org/important_accounting_terms_for_interview.pdf
    • http://tiramunaroxajo.iblogger.org/6830124974.pdf
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/ecdb2c.pdf
    • http://mapitunokon.22web.org/personal_pronouns.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lesexugisitu.rf.gd/nationalism_in_europe_class_10_mcq_questions_with_answers.pdf
    • http://dixediw.epizy.com/86391366106.pdf
    • https://s3.amazonaws.com/lodazojamuva/86634213487.pdf
    • https://s3.amazonaws.com/donarepemi/panasonic_6.0_plus_phone_owners_manual.pdf
    • https://s3.amazonaws.com/memexelu/sandisk_clip_sport_8gb_manual.pdf
    • https://s3.amazonaws.com/mejados/90668237346.pdf
    • https://s3.amazonaws.com/kuboki/how_to_describe_anger_in_writing_examples.pdf
    • http://zejusamipokera.myartsonline.com/nevemejivorazapiretasoro.pdf
    • http://nolopunupibu.rf.gd/37469533671.pdf
    • http://jubogaju.atwebpages.com/accounts_payable_configuration_in_sap_fico.pdf
    • http://rotigolas.epizy.com/karmakshetra_bengali_newspaper.pdf
    • http://xazikipigenuvi.rf.gd/income_guidelines_for_wic_in_texas.pdf
    • http://jeduxotikeg.rf.gd/62607040244.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f2.bin
811db33c54b137562feca7da0b7b66820b5f4b4e8976f720f293e14c5a85c652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 5176 bytes
font_01_sfnt_off0000e279.bin
019b60463ac20e8216baa88e0de9b08b8ef7330100bad6d5ce327c4e7ebd7a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10276 bytes

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