Malicious PDF — malware analysis report

Static analysis result for SHA-256 781ae2e503723f6c…

MALICIOUS

PDF

96.1 KB Created: 2021-03-28 16:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 44374ab61be3aa5e5e6dd57dc09029aa SHA-1: 521cda4ec4c5ffbe88554d1c22a268b99aa2e70e SHA-256: 781ae2e503723f6cce5d109808ac9171c811ebf52a9e67e9c42b00643b321c09
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=legal+service+authority+act+1987+pdf PDF link annotation
    • http://xogavuw.medianewsonline.com/business_process_automation_aris_in_practice.pdfIn PDF document text
    • http://drovazvenigorod.ru/72938592889trxjf.pdfIn PDF document text
    • http://job-finder.space/zovifexaditibovax1vue.pdfIn PDF document text
    • http://reduslimitalia-official.site/what_pmd_stands_ford865q.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/dikuvinatekelawope.pdfIn PDF document text
    • http://busibear.com/koduput8epre.pdfIn PDF document text
    • http://prazdnikprosto.ru/36106311324swf3f.pdfIn PDF document text
    • http://jufimeja.iblogger.org/81777830287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxiguzemafuj.rf.gd/bigeximufa.pdfIn PDF document text
    • http://pisisagul.epizy.com/tovezewaguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1b9317-4852-4844-a976-7d4fd3a823f4/how_do_you_set_a_timex_dual_alarm_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/87349080249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e7d628-163d-4045-9be9-850e4d31a54d/apachebox_maven_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/11036968472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca975f53-14c7-4c85-b69d-369b3728394b/ejercicios_de_estadistica_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5284b87-11b4-4371-8b76-37b9503efaf0/john_fox_seattle_displacement_coalition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21833a0c-b5c9-4275-af5e-236a689f8659/316491665.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/jalevubupiwevemiwedikaz.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_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 6004 bytes
SHA-256: 4f9f42cf6bb5154e2ffc623a925f1f95e72c621c43d4e39c1ba4af579c789758
font_01_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 11304 bytes
SHA-256: 4f12e329d7169dbf54343be6c30b8e2c94cb20ae83d08263054ea465033b3034

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