Malicious PDF — malware analysis report

Static analysis result for SHA-256 4112a04515bd5dc9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-04 23:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a76cc1f619d17feb4a52c299fe4b435e SHA-1: 21c663e3df113fb449cae509b71bbefdd14ae950 SHA-256: 4112a04515bd5dc9fad93010f73b54ac8fe617262ca05216bf209524ed115397
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 0.9996

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://xajibur.ru/wix?keyword=abo+gear+beach+lugger PDF link annotation
    • https://cdn.sqhk.co/keximovib/hfhcsdE/2905881222.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/fkLhghj/uganda_knuckles_know_da_wae.pdfIn PDF document text
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/27492e1.pdfIn PDF document text
    • https://laxoweveludek.weebly.com/uploads/1/3/0/9/130970009/bikuzerixuzin.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/RgfibJo/warzone_2100_maps_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5ff1bbdd6d10a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5ff4bc9358e07.pdfIn PDF document text
    • https://cdn.sqhk.co/nubenirosife/hbjjRja/twist_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/0Cjj9NO/leatherface_texas_chainsaw_massacre_mask.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_601dccd2808a9.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/bizuziv_dejudexafuvako_jugulumabi_wixuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sample_us_citizenship_test_questions_and_answers.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_15994c940a2549e9ac11cc79ebc18599.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/79327569950.pdfIn PDF document text
    • http://dadiwewoweziwi.epizy.com/frankenstein_1818_text_chapter_summary.pdfIn PDF document text
    • http://fidosofesus.rf.gd/assessor_report_d_of_e.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/lafamogabi.pdfIn PDF document text
    • http://fixadamobus.epizy.com/dinomino.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_f876debbb8094e139ee133795eafd5ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/chlorella_nutritional_information.pdfIn PDF document text
    • http://fenigubigona.epizy.com/90618462139.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5012 bytes
SHA-256: b94c93a1c07357cc02b60a4a793cb6511f7035964c8d9b2ac855aa0dce34f934
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10220 bytes
SHA-256: b22af93612b8c0214203f34137c91c56005c8560f37b58060ac6cf0a6234e81d

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