Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c61adc6bb7d2be6…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 21:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b71aed1d320e233eee63ba75e792ce1 SHA-1: b760939daed79627f8a663ca48107cd562d5b02c SHA-256: 2c61adc6bb7d2be6a6cb7e0c06b08bd260ac906e3f6ebdfc6da21d7385db97a0
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The primary redirector URL, 'https://baarspo.ru/strik?utm_term=toefl+essay+topics+list', is used to disguise the malicious intent as a resource for TOEFL essay topics. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=toefl+essay+topics+list PDF link annotation
    • http://zubiki.top/kekoza9pgvg.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/rodesine-rowatotinowir-valaset-watisugumet.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jLidZbz/fipixofitasete.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/sixejamibali_warugenifa.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/vulebotiwifilimaten.pdfIn PDF document text
    • http://reduslimitaly-official.site/80454595469gtr2r.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/commandant_s_reading_list_2020.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/tipumaxebasa-nikigumemaf.pdfIn PDF document text
    • http://talemine.getenjoyment.net/25527272217.pdfIn PDF document text
    • http://olx-delivery.cc/harry_potter_1_cast_oliver_woodg82bn.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/qDiigib/nazibozigimerakebokum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/alzheimer_etapas.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_7a2e1151000c4834ba493c0bc7da2a5f.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_79470300f6f64973b33283ae5a42410e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/rigajixom.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/polo_shirt_mockup_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/fedege.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/15554318198.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/27594197444.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_4416bc2b8f554a6688b8bb02d42786ce.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 4648 bytes
SHA-256: 66f48ce8a4a55118f4a9e2cc2b60eda63f9185db32a11abdead63c7dc693b429
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10588 bytes
SHA-256: b04ca4ca82d09f13822f245074d884e85a55cbe9da2c12c5fc9e39a8a8f2a15a
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71