Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e0baffaa7b0b00…

MALICIOUS

PDF

72.4 KB Created: 2021-04-01 09:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 930f68f140ea40f4107afabbc53b8225 SHA-1: 773be8dcf961e7617af78e0bbcb5868a857f9f5f SHA-256: 04e0baffaa7b0b0019352e0cd6df93419269581f2e95fb17b09b4b0b5a1ba9c7
126 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=critical+race+theory+an+introduction+3rd+edition PDF link annotation
    • http://bolawixefop.mygamesonline.org/boyle_s_law_and_charles_law.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/3897484.pdfIn PDF document text
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/4917961.pdfIn PDF document text
    • http://toleritikujomuj.22web.org/38982987782.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/i6Pgghj/lg_xboom_go_pk3_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/jihhfUh/creating_a_business_plan_template.pdfIn PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/nasotokivi.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/3263972.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/pictures_of_hollis_woods_cast.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/waratasaperoganered.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_2c0892bd7d2a4a4391df7c2c639596cf.pdf?index=trueIn PDF document text
    • http://xurorovesi.epizy.com/46379862323.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/althochdeutsches_wrterbuch.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/kewebudamunudixatezodo.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/the_owners_manual_for_the_brain_4th_edition.pdfIn PDF document text
    • http://junufesuvu.rf.gd/lisekelufezixis.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_7f5e74739b884bbb8a11c9e63346e249.pdf?index=trueIn PDF document text
    • http://giduzorim.epizy.com/cube_world_pet_guide.pdfIn PDF document text
    • http://romezegipoxo.epizy.com/jovowiwakog.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/32387664940.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 5020 bytes
SHA-256: 7179ef80e4bcc2f1d82bc34f7cb928865ff6dfb85222223a2a7ff0d2bd975099
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10576 bytes
SHA-256: 7e692f8ebd95b9579e6769cca9f7b144201dc590d94d99f3326c47510888cdd1

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