Malicious PDF — malware analysis report

Static analysis result for SHA-256 0499cea39e582792…

MALICIOUS

PDF

81.5 KB Created: 2021-04-03 09:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7a0913ae45b2f713aa219f018e83a54f SHA-1: b7c1dc218294d3f010edca1b9fd8cb143d6ad19d SHA-256: 0499cea39e5827927b5304e5147012f68ddb0bc9635fefcb03b5240f99600ac2
156 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 point to other PDF files, indicating a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the presence of numerous external links, some of which are suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/award?keyword=books+to+read+while+pregnant+for+the+baby+pdf PDF link annotation
    • http://streichpack.online/download_slumdog_millionaire_full_moqhvjn.pdfIn PDF document text
    • http://scriptbook.xyz/how_to_call_a_loverpfuoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/aljHPhe/zumidoxoladuruvomomi.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/traduction_allemand_franais_gratuit.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/107d4bd2039c223.pdfIn PDF document text
    • http://ccckkkkk.space/cartoon_elephant_picturesjpv9a.pdfIn PDF document text
    • https://pusexijubod.weebly.com/uploads/1/3/5/2/135296384/6952133.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/mDygfzH/minecraft_modern_beach_house_map_download.pdfIn PDF document text
    • http://phtech.site/pinugesoavwoc.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzilogabuwu/bBaeaid/texas_world_history_textbook_answers.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/garalotuvof.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/90853318738.pdfIn PDF document text
    • http://shopsupergood.site/xegaxopodutaxbx1w8.pdfIn PDF document text
    • https://cdn.sqhk.co/fevazufalul/gekjfhL/arkansas_boaters_license_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/55166050548.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/how_to_replace_ge_spacemaker_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/what_charger_does_a_samsung_s9_use.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/vosidagimorofamiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb45130-4712-4dcf-a1fe-74df70e08b62/where_does_the_saying_by_the_skin_of_my_teeth_come_from.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/chamberlain_nls1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac02ba5-1b3d-4187-841d-423b498367c4/introduction_to_linguistics_what_is_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c41130-6c11-4ccf-a821-c8960469a959/48534028342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78513a26-2457-440a-ae05-74f38bc7d591/56570221093.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/litugaduxokutuzevu.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_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 5748 bytes
SHA-256: 7349dea66c8f1d8a5fbe2eed4d28ecaf1b10765b35f021e446e273a26db39bd8
font_01_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 10896 bytes
SHA-256: 02b37abf748258e4d3e3b0047b680db3eeadd8d971c44eee63ed8f4ecd5d5532

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