Malicious PDF — malware analysis report

Static analysis result for SHA-256 b355e5d622e9a988…

MALICIOUS

PDF

81.9 KB Created: 2021-03-10 05:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d51483a3f7bb4b7a1c057b558ecc2165 SHA-1: 04fb7bf04fcb522956c692c136b35833c8ab0719 SHA-256: b355e5d622e9a988de1f14a54c41af55f972c3ec47db990bf8e601579bac3235
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious or unknown domains, including one specifically flagged as an invisible link lure. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://dugedepap.ru/wix?keyword=wicked+deeds+movie+trailer PDF link annotation
    • http://choosemadam.site/36429626990norpd.pdfIn PDF document text
    • http://loginwithfb.site/mcgraw_hill_my_math_grade_4_volume_2_answer_keyz4k23.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/poisonwood_bible_online.pdfIn PDF document text
    • http://nuveclovet.xyz/797526858047bf0t.pdfIn PDF document text
    • http://freud.icu/nafadixaxulozakfgvkf.pdfIn PDF document text
    • http://train-home.ru/ximitugazedobocd6kl.pdfIn PDF document text
    • http://genusadnlo.space/66801691996kssd4.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/why_did_ruger_discontinue_the_sr9.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/percy_jackson_the_sea_of_monsters_chapter_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/963b5997-7c2f-4753-8de6-d34fb8acd80d/tubidy_mp3_download_gratis_mimp3.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_db60ff6226864aec821b424384e00c2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd306b4-69f7-407f-a777-7b512ed3c0d5/63657278499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c26d3f-f221-441e-b45c-84a965f54d80/57434618543.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/xivibo.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_2c56d7ae7ebc4d709a02800e7aa98ced.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/tozunokolebepo.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_cf2ee9f8df254cfaadb538eebf1a5de3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/adobe_acrobat_professional_trial_free.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/gulobolotulodutakigas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91bdb48-c041-4f27-8a08-ae4ce4a68ef5/fofipubavonasiwofof.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_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 5220 bytes
SHA-256: adbdcf444f41f8ab3ed48a4393ac21e2790e1805244b172bdb4f4c6a8e849967
font_01_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 11060 bytes
SHA-256: dbf7f70d684c3f84d6e7be9dab8f4c6761461371e64aaaff7fbb28bb2d38ee81

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