Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30b99c7456528d9…

MALICIOUS

PDF

72.0 KB Created: 2021-03-12 14:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aaa2e30cd490bf0c83c88b0202b7c19d SHA-1: a43df58fc1aa6b66d0bd852d6bc0c2d696dce3a8 SHA-256: a30b99c7456528d96595eee2a15ff17e45eef65045b573c05929020ea12acaec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=air+mass+worksheet+answers+page+4 PDF link annotation
    • http://redita.fun/crush_ball_smash_color_stacker4kilu.pdfIn PDF document text
    • http://medgaj.com/adobe_photoshop_cc_camera_raw_presetsa7u3q.pdfIn PDF document text
    • http://harmony-market.ru/basic_macrame_knotsvplk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5ff38d197899f.pdfIn PDF document text
    • http://design-kvartira.info/kajamixaxilebenovagitidennord.pdfIn PDF document text
    • http://smilex.club/77817460773kqfol.pdfIn PDF document text
    • http://letgtma.bid/apa_format_bibliography_tagalogfy79f.pdfIn PDF document text
    • http://mivetys.xyz/call_of_duty_cold_war_pc_price7dlj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd263fd2c277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_60282564ca8c5.pdfIn PDF document text
    • http://yatvoyya.fun/fikuvufakugatupor06hn7.pdfIn PDF document text
    • http://ranking-se.com/iso_10013_ultima_version1xw8m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_385d703ce82c4acca13873fe73080481.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_7b89769d80e54e0ea498190e1995819b.pdf?index=trueIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_17e950d647934dde9380c7b1b589ae37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/41226347205.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_66d147c04ba84aa8b0af01b2f7ccd779.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f079f6e-8b4d-4b30-b4da-b6e901fb88ad/21214158289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce84e70-b303-45e4-a1a4-48d7a4ac3715/vocabulary_workshop_level_blue_teacher_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/bhojpuri_gana_video_3gp_new_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de88f8b6-dd28-404c-affd-108aa59fbe2e/best_jeep_mechanic_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67955356-7e0e-4b47-a6e0-3cbeefc168b3/naketulotubotetutezobew.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 5436 bytes
SHA-256: 771e0956ea1b9171d2a5f8c484ede086dd92c1c5e0e6c27d302540addba6528c
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10360 bytes
SHA-256: 9682da6d97a1dce8aa6861378919fac9249ad497240ac421fe916a3b67570a72

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