Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d6f7f826a76601…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 23:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e9f24661a67e1e388a1a6d7c9cf33223 SHA-1: 65c0495932c737f080772a9fc338e01e2755b365 SHA-256: 65d6f7f826a7660123e87e60b374b0dbb36219a75bb07a33a0821c16b13f896a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF documents, indicating a link farm designed to attract traffic. One of the primary external links, 'https://maypoin.ru/strik?utm_term=1995+yamaha+kodiak+400+oil+filter+location', is flagged as suspicious and likely leads to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://maypoin.ru/strik?utm_term=1995+yamaha+kodiak+400+oil+filter+location PDF link annotation
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/a31bcf2.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/merchant_of_venice_summary_act_4.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/74127931667.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/mikaborusevuzupa.pdfIn PDF document text
    • https://lefipotadap.weebly.com/uploads/1/3/5/9/135959992/jagibukina.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/62170429767.pdfIn PDF document text
    • https://segamovav.weebly.com/uploads/1/3/4/8/134892249/b887bdb2.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/jefobexapulow/mathematical_modelling_in_plant_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/enough_and_too_grammar_worksheets.pdfIn PDF document text
    • http://nisajemisekim.rf.gd/11656756278.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_a031e172011f4c8999f2e6a180346e4c.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_84dc64c8f28a483ab0b078ead28e436e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/52363905731.pdfIn PDF document text
    • http://rufedum.rf.gd/formation_microsoft_word_2010.pdfIn PDF document text
    • http://dazotetitow.epizy.com/wd_my_cloud_ex4100_hard_reset.pdfIn PDF document text
    • http://wadepexarupuwa.rf.gd/calendario_escolar_2020_y_2020_sep_195_dias.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_b7569ea39984496bbccc7f5808c8b72a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/format_cd_drive_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/rosugedotipujetigogije.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/avast_antivirus_premium_free.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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 5716 bytes
SHA-256: e36416cd60b21d3e0ceb964d69816d263472cc8a135b537bf4720f5459a80301
font_01_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 10612 bytes
SHA-256: f16a3753016f06353a5d1b7bab4d4bb04a81c1fae0892763a78e8223c647cd89

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