Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb5ca912eb1c999…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 04:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fcfcfc8f9430bea9ed817744b9458afe SHA-1: 9a996fcc08774434804484de007fc99f4a35b2c6 SHA-256: 1fb5ca912eb1c999ab576f46e9d89cbfc0394cb8428cc4d0084e0d84ba462f3f
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to fixing refrigerators, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=how+to+fix+a+fridge+that+is+not+cooling PDF link annotation
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/48987.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/tevetugegu.pdfIn PDF document text
    • http://vodaxuf.iblogger.org/macsec_configuration_guide.pdfIn PDF document text
    • http://udilische.club/44182837338zx9ly.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/6702134.pdfIn PDF document text
    • http://karaulovlife.site/58741163524qqyje.pdfIn PDF document text
    • http://azorocheat1.xyz/quality_management_terms_and_definitionsct5cx.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/pulavokaxe/41484825339.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/pathfinder_bardic_masterpieces_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/zuwokuruzo.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/jerifoteviz.pdfIn PDF document text
    • http://nudujefor.epizy.com/video_player_free_for_windows_xp.pdfIn PDF document text
    • http://lakobomupixa.epizy.com/happy_birthday_to_me_gif_video.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/78278650683.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/dead_space_apk_1._1._41.pdfIn PDF document text
    • http://xotewewo.rf.gd/raroxanunopogiruxutotova.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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 5404 bytes
SHA-256: 082e83a783c7b239ca28c71a8c3ce9849736f70b7e7fb9b3c0971e51c3ebf3af
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 10812 bytes
SHA-256: 1f960c6726cc2539bb0bf7406b89f1c970d9f3419e1e214ddcff935df4999b81

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