Malicious PDF — malware analysis report

Static analysis result for SHA-256 135836ea472cec3d…

MALICIOUS

PDF

77.8 KB Created: 2021-05-31 21:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 532912b0f39201a5b03b57fe481e41a5 SHA-1: e97e4f6b3ba1b6f073083ed0a0c5f16f02fa732b SHA-256: 135836ea472cec3d8839b71ad66876625e79127aefc4b964c207cb10463d1629
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://zajinet.ru/123?utm_term=first+grade+reading+comprehension+free+worksheets PDF link annotation
    • https://gunajotigur.weebly.com/uploads/1/3/4/7/134738866/1437050.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/rerat-dulutovasodoluw-zevoviwine-vatalutol.pdfIn PDF document text
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/83b6286528.pdfIn PDF document text
    • https://bikakajuje.weebly.com/uploads/1/3/4/4/134431990/46914c53.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/rajanujone.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/bufixifipe.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/zuzud-tijikenigenene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413241/the_power_of_critical_thinking_5th_canadian_edition_ebook.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144416433/famous_quotes_on_friendship_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cc6d53-b48c-47ea-a898-bd304cc63bd2/wudarobel.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/pokemon_light_platinum_gba_free_download_for_android.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/41045904608.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/gamofevijuguwakepavemevew.pdfIn PDF document text
    • http://dewubuk.pbworks.com/f/attestation_dhbergement_exemplaire_la_banque_postale.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/72117651658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89620556-e2eb-45ad-8649-aca6083826d3/battery_charger_for_pride_mobility_jazzy_select_6.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413289/free_printable_grammar_worksheets_for_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaa66a9-8b02-458e-9a5f-f03dbb3f373d/bafewexopabunorus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14257706-94be-49bb-9f4a-230ebce90e3c/74850127545.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5648 bytes
SHA-256: 79cbff7b6ec050f61d318b1a2da82835d06c5678fb926c989514ceba2f6662c7
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10780 bytes
SHA-256: cba5c3cf6a5853e5e14d7f2f3d8f846b5191e2f1a02c4c498bec8937cb78b779

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