Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd364cd92cca4789…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 10:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 429bc301853d5071c3ad41aaf3426058 SHA-1: 2a43ee0511172780c419a0817e35ce4328b1d72a SHA-256: dd364cd92cca47891906a34903d51c87783d1c074df73b0fdf865ddc2e48ed9b
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files with numeric slugs, indicating a link farm for SEO manipulation. One prominent URL, 'https://pelibifir.ru/wix?keyword=snaptube+download+apk+old+version', suggests a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=snaptube+download+apk+old+version
    • http://rofuxipof.mywebcommunity.org/feliz_navidad_acordes_jose_feliciano.pdf
    • http://zogometemo.sportsontheweb.net/marantz_cassette_deck_repair.pdf
    • http://rawoxaxevog.mygamesonline.org/68147191584.pdf
    • http://sepoxudozixo.sportsontheweb.net/bwv_565.pdf
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/5732739.pdf
    • http://pokezokebawi.mygamesonline.org/ruvobasazujadozudutuner.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/7790923db790c2.pdf
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/6a936387aa8cf1.pdf
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/1950991.pdf
    • http://bugilinupapud.mygamesonline.org/tivetok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3af798c4-016a-4b65-a261-80ac4aabca03/80551246244.pdf
    • https://uploads.strikinglycdn.com/files/05b080f7-a6a4-4716-89d2-60372ac8429b/36396023975.pdf
    • https://uploads.strikinglycdn.com/files/5c6527bd-c65e-424b-919e-1f8e7587c3ed/spelling_power_grade_7_answer_key_lesson_4.pdf
    • http://futikuzita.onlinewebshop.net/week_no_calendar_2020.pdf
    • https://uploads.strikinglycdn.com/files/70072485-79d5-4216-971f-568bbffd0d14/lord_of_the_flies_chapter_2_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/b1fe08ab-94df-4863-8d5b-a059af119b3a/guxezotidukunexixogubirem.pdf
    • https://s3.amazonaws.com/wufujudisu/24422099062.pdf
    • https://s3.amazonaws.com/muwemivumazulax/why_is_grounded_theory_useful.pdf
    • http://gefuwaw.atwebpages.com/deripuweminezare.pdf
    • https://uploads.strikinglycdn.com/files/7d8f5f4c-92ea-4062-96f1-e422d5a0fc63/is_wealth_tax_good_or_bad.pdf
    • http://tivakifuzir.atwebpages.com/easy_baby_blanket_crochet_patterns_for_beginners_youtube.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_off0000f55e.bin
db7d2ce427eb1b528d57cd8170af0389141df23e295f5eb96ec1e2993c353d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5412 bytes
font_01_sfnt_off000107df.bin
dfcb8f7abc032a82f8f8ba4332fef33cde688f493e930fdbbffc75580d7dfa07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10592 bytes

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