Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb1f17370406987…

MALICIOUS

PDF

75.3 KB Created: 2021-06-06 00:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 603d4ea90bce4986fe82872ad18a7e8c SHA-1: ef9505f0b36007b1b1fe33c892338df42fa54bed SHA-256: 7fb1f173704069878ffbf88077e3d2d942e6afd61a4e3a968e076f72483ad6e2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/pbw?utm_term=can+i+eat+rice+on+bright+line+eating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417403/normal_60633c3204406.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/ed8282c350bf8.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/ae01ee9fc32355.pdfIn PDF document text
    • https://jasofemelufes.weebly.com/uploads/1/3/0/7/130740231/kowezunijalub_lodiniw.pdfIn PDF document text
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/pevufa_jiloroz_peluminiwu_gudogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_604863a9a0cee.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/xanumifusuro.pdfIn PDF document text
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/xonukijesijur.pdfIn PDF document text
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/pineramojizozok.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/6432533.pdfIn PDF document text
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/748a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_602b69e65a759.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/gefijipofis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_6056b87440990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32688cef-1fb4-4b7c-a4af-e49b4616840a/how_to_make_easy_smoothie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d4fe3a-e233-4806-8acd-42f69517ddc9/nimuramefibajusanotafodul.pdfIn PDF document text
    • http://tirotibixup.pbworks.com/f/sample_of_authorization_letter_for_claiming_philhealth_refund.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/how_much_does_a_chief_financial_officer_make.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426363/xobasabobiwukodetaluwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0464a63-472c-46cf-bd69-db1cafec499b/texokokogogabofeto.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 4928 bytes
SHA-256: ae12d6fd26a00e0c155a7617bf5db24265e33450319a83127e7f42c1c7fe3b2f
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10664 bytes
SHA-256: a3c9e0af4bb74b2819e2bd8b5287732f22df771f24106a90ad014bcce21d6fc5