Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c2bdd240999f4b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 02:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8c8987f24c8c277d5b39dcadfe9e52a0 SHA-1: 8ac72df7dd8f07812d16888a8010f827df07a5a5 SHA-256: a1c2bdd240999f4b8dfb7ac9509d211705aea725d54fe0ca57737c494a8c2ae1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://krisoc.ru/uplcv?utm_term=odia+magazine+download PDF link annotation
    • http://vattucongtrinh.com/userfiles/file/85908511675.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/fubalo.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/78674063462.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/zanelaletipana.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/92750040757.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/puxurekat.pdfIn PDF document text
    • https://medius.sk/userfiles/file/80880101392.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/wuvulozutelenu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/34402394386.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/55613665673.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/15513940055.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/jikanedo.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/17690992567.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161416a2ccb906---difusikik.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/mevekebupa.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///834714128.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/litufivofavemuvoboj.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/89431627977.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/tokoxaridupilinad.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/jakukujozumoxi.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/tikifukimumofi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135de80be2e1---35265048317.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/43989684998.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19777248124.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 10396 bytes
SHA-256: 038561b31556e80de73a4fd2a15885e6f95fa72aeb16a76558d5682ad53dc109
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 17852 bytes
SHA-256: 931791d4ae2cf19b8a5bcb7e67bb8583ce4f10c70bc88e4c61d59fdf3d5c0b97
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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