Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e844c4362184c55…

MALICIOUS

PDF

77.0 KB Created: 2021-03-27 11:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0314f2f5b03660d8358ab7127ef5d224 SHA-1: 75cd648ff8fb66bb4d357ea2ba6f691ce927b362 SHA-256: 4e844c4362184c55bed8fa4d3037fdcedc22ffcdd18b020290fece643d0e4826
206 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 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://jumiwimov.ru/wix?keyword=spanish+2+final+exam+study+guide+pdf PDF link annotation
    • http://flylovel.com/concept_review_photosynthesis_and_respiration_continued_answer_key5bpsn.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hageThd/the_legacy_2_prisoner_walkthrough_part_7.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/QPOihZ6/pirowijixe.pdfIn PDF document text
    • http://shop-onlain.fun/navotelagizer9u5wr.pdfIn PDF document text
    • https://cdn.sqhk.co/kowipopi/jisAhhA/tegituketisif.pdfIn PDF document text
    • http://gallery-shop.site/jowuripamifatinakadebivehhcuq.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jfgEZiy/16566054417.pdfIn PDF document text
    • http://vclean-sale.shop/zizisusasonafuwojigapxh5e.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/c7l6lhc/12716489864.pdfIn PDF document text
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/5324336.pdfIn PDF document text
    • http://vas-rem.ru/how_to_lose_weight_well_diets_20204b8ma.pdfIn PDF document text
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/e87f8c133a.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/grgjgc7/adverbs_of_degree_worksheets_for_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/NxTWkjg/admin_template_html5_css3_free.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/5510397d-1e80-4c0c-b4ad-e74d50b4272b/netgear_n600_dual_band_router_wndr3700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71e99e6-6bca-4fba-91bd-e1bdff85c8cb/73477485214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5f0759-fd7b-4da6-ba58-6bf6136887db/is_the_phantom_of_the_opera_movie_scary.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/xewuka.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/how_to_get_your_cdl_during_covid.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/bachna_ae_haseeno_songs_musicbadshah.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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 5764 bytes
SHA-256: 9d813b526d1b9778b026ca40821c4c921301fe4bae543bc25ef62590f1da8290
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10716 bytes
SHA-256: c78938d946e9c494f9eac346a605ee0bc87d90dddf71ac0c92544c950718f004

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