Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c3de9e0a7c17f1…

MALICIOUS

PDF

82.1 KB Created: 2021-06-10 04:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5d22ba1c9c476e8a49ef3dd0c9a44e2e SHA-1: 3ff3e0d32dc05b4769fb67be6f50fcf44af9e36a SHA-256: b8c3de9e0a7c17f122eb4e4df0939b0c4df8583a99d2ae9ebda4d05125c5c6cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme designed to drive traffic to potentially malicious sites. The embedded URLs and the heuristic firings related to link farms strongly suggest a phishing or content-scraping attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/pbw?utm_term=present+perfect+tense+5+sentences PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368999/normal_6008768fe8f1b.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/xewunononelubeki.pdfIn PDF document text
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/2269924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_605cb034338ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_5fd769d9ad3aa.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/loxajo_nunazanudigo_xavivivibibugaw_talotum.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4483365/normal_60b267f63c4c7.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/4f1c1623-9d4d-450a-949a-284aad9f5825/the_leftovers_cast_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39ab6b0-2b35-4ac2-960f-a467ba33b400/what_does_a_downward_arrow_in_a_chemical_equation_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f652e0e-94a7-483a-876d-ff03448ad0fb/washington_post_subscription_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2952cf9-b960-46cd-aaf5-7c211539e6bc/how_to_write_a_reflection_paper_sample.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144627273/navegador_para_smart_tv_samsung_download.pdfIn PDF document text
    • http://tujedet.pbworks.com/w/file/fetch/144628098/72552938740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176684dc-1cf2-43d3-9e34-4e3f946fc3ce/tesejikatejulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e7a868-3b20-46f1-ab50-6bbe687f5278/12733069417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b39992-ba17-4a61-8727-4b0fc18f2d3e/74975014686.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144497865/gegiwekufisozaraje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f847ce4-08bf-45f7-81b2-ed97a209e871/gopro_hero_4_black_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638c3659-ea63-4404-8840-903efbc60129/how_to_make_a_fly_tying_vise_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea58c31d-a6d6-4382-946c-7ba9205660fe/android_sdk_tools_free_download.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144992370/16655637524.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/vipoxoviveju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bc8b37-b10b-4ddb-855b-557f037c0f52/gizinefolobezuzemeti.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_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 4892 bytes
SHA-256: 85a82352688cbb69be9282047fe3ebad3047bf9bd7f757168f7ee60418fc34fa
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 10960 bytes
SHA-256: 4c2202c5acfa29b1c5059158ac8e7376e99555ef362137c1e81f86a920d7982b

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