Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1865c15abcf80c…

MALICIOUS

PDF

71.8 KB Created: 2021-04-05 17:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cf4e87b3d25fa46a0d589b86083322b3 SHA-1: 31a9b18e01fb7da83bccfe7eec91abba800a165e SHA-256: 6d1865c15abcf80ca8ec9d030a786c55a636b3a48bce776b98f1572f4419d384
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The embedded URL 'https://resalured.ru/strik?utm_term=add+up+phrasal+verb+meaning+in+hindi' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=add+up+phrasal+verb+meaning+in+hindi PDF link annotation
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/8757235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_60402e678f228.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/inter_1st_year_cec_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5feb443daac29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5fe0b494636f3.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/fe09781f8.pdfIn PDF document text
    • http://bezidadi.iblogger.org/brokenness_surrender_holiness.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_dbd920ec5e7c4d569a1627378b977656.pdf?index=trueIn PDF document text
    • http://kutoduno.rf.gd/ost_diabolik_lovers_more_blood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5127499-d58d-4139-a0e7-390daae46cc7/furefedumatatilopilibigov.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/census_2020_application_form_download.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_bb91aafd3afa4a8588867d340f5b5d54.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_1c1bc1be034c43df9022ce8acad90ac2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd56c11-f505-4d0e-a35c-6afe5f0fe2a2/hp_laserjet_p2055dn_driver_mac_os_x_10.12.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_be605e3fc86b4dd38955e994bcd46f73.pdf?index=trueIn PDF document text
    • http://dapizodipe.myartsonline.com/mild_mental_retardation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865cd54c-c30b-4e59-9c65-e8c64d7b8893/motorola_droid_mini_case_ebay.pdfIn PDF document text
    • http://fogetakid.rf.gd/rilabolakijekujava.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 5560 bytes
SHA-256: a50a77ac4654acf48dac4cafebe977ffa3e4e6434cd079a40e5e462033c9cd90
font_01_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 10980 bytes
SHA-256: e2c39ad5d412081e826098e4b14951a3c10cb6362d64cd5f6b416452fdf3031a

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