Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2b234ea753350f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 20:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 99f5ee595e2258895ec5eddd17612dc6 SHA-1: 20d8a9d8b944c4db467bf9b1f49e440e9ff3d1e0 SHA-256: 8f2b234ea753350fb082ead60e82c7018fae9612912e287affab97f2aed8dd35
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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or scamming by directing users to malicious websites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

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.
  • 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://druttle.ru/strik?utm_term=convert+cycleops+fluid+2+to+smart+trainer PDF link annotation
    • https://cdn.sqhk.co/nokulebepoba/ghTicif/animal_jam_codes_2020_for_sapphires.pdfIn PDF document text
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/vorubezinire.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/letesuzudo.pdfIn PDF document text
    • https://kuvobawodamelis.weebly.com/uploads/1/3/5/3/135350379/815b1.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/4882c428.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/5439469.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/lidujikojetagapifu.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/blood_type_o_positive_diet_to_lose_weight.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/0c3a5.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/nerowefudukejawaxole.pdfIn PDF document text
    • https://kamubopo.weebly.com/uploads/1/3/4/6/134631829/totav.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/6seyqSD/ringtone_new_islamic_download_mp3.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/141c9add50e04.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/4sTBmhc/frozen_sing_along_karaoke_machine.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/reniwinatikuzuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff4a1b3f-98a2-4a2d-a84d-c53bae18c54f.filesusr.com/ugd/debdc1_cf6e7b8a99e44111991a08d4a24b4041.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_f7a5b158302141778374db5e7390e5fd.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_351a3850e5634138ac12fb0a984c96c0.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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 5500 bytes
SHA-256: 14fdacdc7b2878d695cb3e4cb7b08546fae50dabc953d98d4c465d54696d8a57
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 11124 bytes
SHA-256: ca2758a209ba5782db21fcd9d7b0c4c0b26fa3a89da3fcd9870a1ebaa486d373

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