Malicious PDF — malware analysis report

Static analysis result for SHA-256 6198f1c5506e8365…

MALICIOUS

PDF

67.7 KB Created: 2021-02-14 17:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 670d3e6a416073330cc168d97257352f SHA-1: 8703db8a50fcc74518229db2c331e9018d25700a SHA-256: 6198f1c5506e83658de19eef0f79b8371d9b8882d693f5428f9e1fe4e93ba040
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-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://seumenha.ru/aws?utm_term=adobe+caslon+pro+italic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5ff8f1c188560.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/4283112f.pdfIn PDF document text
    • https://jojesiwanoj.weebly.com/uploads/1/3/3/9/133986560/cd0e67bd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5fc90a845077e.pdfIn PDF document text
    • http://cuzinfo.ru/passport_application_form_printable_2019lhyof.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/baxezuvaro.pdfIn PDF document text
    • http://zozagemidifisep.22web.org/inventory_balance_sheet_account_type.pdfIn PDF document text
    • http://catsism.com/dissidia_duodecim_labyrinth_guidespr00.pdfIn PDF document text
    • http://normal-id.com/tuwubofixaew0cp.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/1860030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_601dc0421b11d.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/b6d00.pdfIn PDF document text
    • http://sosutisokalelul.iblogger.org/aula_virtual_unan_managua_informatica_basica.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/gulapore/36141436239.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/79192870606.pdfIn PDF document text
    • http://jiwimid.epizy.com/53646502951.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/wedding_day_checklist_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/chogada_video_song_mp4.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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 5196 bytes
SHA-256: 9844cacde123c2ba19fab09c83d7a52129ad476d4619b28f4b9923110254bc97
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 10156 bytes
SHA-256: 6484cfcf4e30b633b548cc718d67a2bbef1b4d5521995308bf1b8fab39cf17c7