Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a78ed55f6e35dbf…

MALICIOUS

PDF

97.3 KB Created: 2021-03-18 03:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65170e50fc08bc95dff6189536b2a17 SHA-1: dc227297154ed7f863cb3cad0a03d77c4d95a67f SHA-256: 2a78ed55f6e35dbf31783de3f5da25e420800ce8dd57b46cea3da7a66e1f8285
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=autodesk+3ds+max+tutorial+pdf+download
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/3e1612441b98.pdf
    • https://zebigogax.weebly.com/uploads/1/3/4/4/134459641/9170987.pdf
    • http://befigter.xyz/tilomikebiwanalemovuwornw1eu.pdf
    • https://cdn.sqhk.co/torazanopuni/eid7hdm/99863199013.pdf
    • http://rastet-malysh.ru/seagate_backup_plus_srd00f2_driverdzvn9.pdf
    • https://cdn.sqhk.co/xovikojux/Egjxiih/rajofuxedamirik.pdf
    • https://cdn.sqhk.co/foxidagon/m3xxXLW/zuzorogala.pdf
    • https://cdn.sqhk.co/govizanorev/jieicMK/samsung_voice_recorder_apk_uptodown.pdf
    • http://zebiripu.mygamesonline.org/pdf_ccna_200_125_study_guide.pdf
    • https://cdn.sqhk.co/bitizulokiva/Ghgghhh/club_factory_online_shopping_app_review.pdf
    • https://cdn.sqhk.co/fimegasaz/tTMhhZM/spellbinders_grand_calibur_instructions.pdf
    • https://cdn.sqhk.co/gixixutiji/c4hehf5/zoseperabijor.pdf
    • http://xitabijasava.getenjoyment.net/starfall_books.pdf
    • http://kind-insta.site/99199249854e0od.pdf
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/d05384264edb004.pdf
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/zodona_jewexezupekegab.pdf
    • https://cdn.sqhk.co/gixezovof/czjjdgg/cheap_funny_race_car_shirts.pdf
    • https://givetowa.weebly.com/uploads/1/3/1/4/131437183/zoguzazaz.pdf
    • http://sowopezamiw.medianewsonline.com/certificato_anamnestico_per_patente_di_guida.pdf
    • http://goodnaturak.space/jipadjglya.pdf
    • https://cdn.sqhk.co/lojeliju/Zqpqpii/download_zombie_hunter_frontier_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a4d54bf-4ae8-4ba8-9d88-7d48dee77684/twilight_eclipse_free_streaming.pdf
    • https://uploads.strikinglycdn.com/files/f3b81829-19a7-46a1-bfbe-17a2c1ea1739/dunkin_donuts_frozen_coffee_nutrition_small.pdf
    • https://uploads.strikinglycdn.com/files/e74a63be-fa70-40b1-b24d-1281c1e93ca0/palipofinosonujilelitov.pdf
    • http://gakamaxoluzes.atwebpages.com/57501480713.pdf
    • http://tevaluzax.atwebpages.com/39329314495.pdf
    • https://uploads.strikinglycdn.com/files/c920b303-6f08-420c-a7fb-ca71345dba05/physicians_desk_reference_2017_pill_identifier.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b36.bin
666cdd84e751ca8ade3b8369010ecb2e5e15496a504d4b918926572ab5f79f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 5564 bytes
font_01_sfnt_off00014e22.bin
b811dcbd29776423688ef61baba88993b4d30ae3eeccefb67da2be1ae2f13f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E22 11536 bytes

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