Malicious PDF — malware analysis report

Static analysis result for SHA-256 987c660b970d3935…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 06:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7afcf6752c1ac701bf7501e7f4f44c90 SHA-1: a49986a4805c23677205352ef95eff5458e5a718 SHA-256: 987c660b970d3935469fbabb1536c69ce4a63b0e90e6a0fbae7ffd7b1c649d55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://lozipotod.ru/123?utm_term=kaalai+vanakkam+tamil+images PDF link annotation
    • http://sibatotud.iblogger.org/rixigarepuwisinisuluvam.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/unfinished_business_anne_marie_slaughter.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/meaning_of_neolithic_revolution.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/vilelumovanigidepe.pdfIn PDF document text
    • http://max-lifting.store/wuritedoki.pdfIn PDF document text
    • http://zoo-taxi.site/lolubavi8fnqd.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/jinikife.pdfIn PDF document text
    • http://bosuloridulumo.22web.org/pefovawufevubusokugetigak.pdfIn PDF document text
    • http://finonit.mypressonline.com/taparekeboxi.pdfIn PDF document text
    • http://zawugexoj.22web.org/31555960496.pdfIn PDF document text
    • http://najaruwa.iblogger.org/second_and_third_conditional_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://balepififeri.rf.gd/lapug.pdfIn PDF document text
    • http://kakiserinipo.epizy.com/36215433156.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/how_to_read_z_score_from_normal_distribution_table.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/unbearable_lightness_of_being.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/nevev.pdfIn PDF document text
    • http://jeximojela.myartsonline.com/85526677974.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/10027755474.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/discrete_and_continuous_random_variables_worksheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 4680 bytes
SHA-256: a3c9de835c666cf3b94627c19f9ef0ce2b22c857947b8934c5f1d02aceeac033
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 5504 bytes
SHA-256: 4a3bbb0afe1df1aab570b0d8a9f5968cd62ac06e8b226fc8575da17d000e23a4
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10328 bytes
SHA-256: dd5a5e67440d19881ce730b7a4d11cca514fd4f44f7baf9ca7be432fd773301c
font_03_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333