Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ba81e3a022fb1d…

MALICIOUS

PDF

88.6 KB Created: 2021-04-01 08:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7783596f3714866d1b7f4c852dac0edc SHA-1: a9d80dc548cea73c78ee6cc63c8ef81f0fd0b84f SHA-256: a1ba81e3a022fb1dcb8e3e02a12acf42cf6c1b3e3a41f028e89b839972ef6769
186 Risk Score

Malware Insights

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

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 0.9997

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://ponafet.ru/wix?keyword=fau+staff+directory+athletics PDF link annotation
    • http://riragukigud.scienceontheweb.net/gejekuzepivewunode.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/pdf_to_dwg_autocad_online.pdfIn PDF document text
    • https://xesirizibolaz.weebly.com/uploads/1/3/4/4/134432563/sifoxinukibilodof.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/2702737.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/capitalization_and_punctuation_practice_2nd_grade.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/mimuzezofa-kavewozide.pdfIn PDF document text
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/dasedexubimifura.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/4879306.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/sarinuzirurop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_d56c98c8fa744a4dbbfa3602a0cc96c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/pajonawizusodefuvite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de26a878-bd8c-43bf-93fb-032e3e3da704/7023398019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d60727-23cb-4b47-b0a2-498ad7b636ff/22932739573.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_37f92f5e71884efa9776b2e800f21c17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/radare2_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970cf1e5-a981-49d7-9233-529c47d30f62/english_vocabulary_words_with_meaning_in_hindi_for_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3c7d29-2019-40d1-be8a-6f44b7719fe2/5966929011.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/17130178672.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_08cb0830dbbe4466b4855cee71b31245.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/15028461711.pdfIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_99021234c0e849f889b03dde6f4cc59b.pdf?index=trueIn 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_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 5164 bytes
SHA-256: 5a124f3b795fac8f3bd1fae3158d65b7ac3f045154ec5c6c31396baab9336321
font_01_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 18572 bytes
SHA-256: b6ce4b5e8ab737bc6fb78e2cb25bc703861231a546ae892db93f3a2e4b2cde53