Malicious PDF — malware analysis report

Static analysis result for SHA-256 977f5d8ebeead738…

MALICIOUS

PDF

80.3 KB Created: 2021-03-21 09:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2582f3a152c02ca90f5e2006b851604 SHA-1: 39aac9b81f159615072f0cd7a0c7cf4fbcbb4fd7 SHA-256: 977f5d8ebeead738249ef60879ad1650b36a4c48ebfd4683ec4fd4a01535cdd3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=critical+theory+today+feminist+criticism+summary PDF link annotation
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/gokidefomuk.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jQjhfDA/grand_prix_story_2_review.pdfIn PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/vabodabukiweretimu.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/cgijbje/mit_mba_application_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/bezupidokaz/jjYaVge/free_get_app_iphone_x.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/jjtjgrv/shrek_2001_english_voice_over_wikia.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/ibjc4hb/highland_games_foosball_table_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_602ddc43e1827.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/jpYQpnG/42360525591.pdfIn PDF document text
    • https://xovoxabazilepot.weebly.com/uploads/1/3/6/0/136054719/wusolugotusukubukuf.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/068e98c73.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/ghggIjf/xedutokelufabidiruxow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_6037b6c3ca93d.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/yhghaBt/kazomojugoxujumetuke.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/najuroposatasadenate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1034aa-98db-4397-8039-32f60d91b357/15444228625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afae1578-4e56-48ab-9c1a-1de010b4f101/depovitafaruwebetuvoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a481d74-43b0-4aed-8a94-a47482c0719a/five_nights_at_freddys_2_unblocked_games_for_peasants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5aa8b9-93a7-4c9b-9dd0-0b0cc29199b6/sirebisetopulemexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41226782-b07c-484d-8f7f-73c9ef20231b/7215125953.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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 5268 bytes
SHA-256: b8c134ad689ec8114fa33a965fa34852806ae6705ccf808a457ba9d31f705fbb
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10712 bytes
SHA-256: 833540e1f38d54cc4829b8b96a8dc21f184941df4e9bca47685b292d12550a55

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