Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aa902da28528a7…

MALICIOUS

PDF

79.2 KB Created: 2021-01-16 12:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ab50b4ee3b1c36695d20dc7f2ccf8be8 SHA-1: b4ee388b602b9e38272484d793a3c89ce118fe64 SHA-256: 83aa902da28528a7970854c39e4f365887b835d214bbc0dd7f8c3493040b3b9e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URL 'https://traffset.ru/123?utm_term=making+stuff+colder+worksheet+answers' is likely part of this redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/123?utm_term=making+stuff+colder+worksheet+answers PDF link annotation
    • https://site-1178588.mozfiles.com/files/1178588/bill_of_sale_california.pdfIn PDF document text
    • https://site-1185297.mozfiles.com/files/1185297/6677699002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5fa8824285ad4.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/6749107.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/most_secure_wifi_calling_app.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/pokemon_go_shiny_list_2019_december.pdfIn PDF document text
    • https://site-1180086.mozfiles.com/files/1180086/zee_cine_awards_show_2019.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/pezozug.pdfIn PDF document text
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/5597747.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/ring_doorbell_pro_instruction_manual.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/23086.pdfIn PDF document text
    • https://radamafusutu.weebly.com/uploads/1/3/4/6/134668344/masesek.pdfIn PDF document text
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/42b9ff0e193f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403404/normal_5fe12016b642b.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/9cbf26a7e78e5a.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/fosagobomap/siduxitexodaz.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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 5444 bytes
SHA-256: 71edf3735eec167b767574dc3a795004c5245e773724d4ead2618b907666c1cc
font_01_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 10584 bytes
SHA-256: 703b95cf5c772a181249102d1fbf38e346e86662fbb69955287f7341e1e4b14a

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