Malicious PDF — malware analysis report

Static analysis result for SHA-256 3291a28d286916fb…

MALICIOUS

PDF

121.6 KB Created: 2021-03-21 21:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9720caa19174fea84c99b0ca43d62a0a SHA-1: 5100540dea64ec7fbc480f0524c415ae2fa894c9 SHA-256: 3291a28d286916fb59b35dfe008044fde23efe5fc1bc6c5d039f03312e1339fa
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=mla+format+website+citation+machine PDF link annotation
    • http://ladyso.ru/2861084339dectx.pdfIn PDF document text
    • http://8bitbeardsco.com/loninizovolibiririr52hne.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/4992240.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/9257506.pdfIn PDF document text
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/8c8ba15.pdfIn PDF document text
    • http://how2clever.com/is_diablo_3_multiplayer_on_switch5tf01.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/342e75bb131.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/76830320275mqxtd.pdfIn PDF document text
    • http://ruwemaroxi.22web.org/19333691840.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/790020.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/babata_namak_free_download.pdfIn PDF document text
    • http://kvrovk.xyz/zotawatimebuxesujy7qax.pdfIn PDF document text
    • http://nashremont.site/vafijum6v8c9.pdfIn PDF document text
    • http://hookup157.fun/how_to_type_alpha_symbol_in_ms_wordjceyl.pdfIn PDF document text
    • http://frasqen.online/10921951494uewae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovusilo.epizy.com/eastlink_tv_guide_listings.pdfIn PDF document text
    • http://wolilawobo.epizy.com/jawefidexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/english_grammar_rules_for_competitive_exams.pdfIn PDF document text
    • http://bexexakik.myartsonline.com/bronchial_asthma.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/60057928033.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/uptet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/97224593571.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/giger_necronomicon_download.pdfIn PDF document text
    • http://jidodurej.epizy.com/cursive_script_handwriting_worksheets.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_off00019de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE8 5360 bytes
SHA-256: b00ff7389c2bc55d4991050510e8a85e53047f83a0a4d15407ad03ef89a8bafb
font_01_sfnt_off0001b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B017 11776 bytes
SHA-256: 01e4bf15ccb92bbe7cbe5783e77546b5236f4cdf1187bd2d1edc7abb0d6cde80

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