Malicious PDF — malware analysis report

Static analysis result for SHA-256 517ec52c272093be…

MALICIOUS

PDF

66.4 KB Created: 2021-02-27 19:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 52e77453d34cb36d367b1364c4bd2293 SHA-1: 72fe53eb093d11f0591cfcf1406b28d09bea2af2 SHA-256: 517ec52c272093beb9fe986c47d598a20fff99711e3db0b2aabebd49c16c6600
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain. Heuristics indicate a link farm and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though obfuscated, suggests a lure related to 'practice problems answer key', aligning with phishing tactics. No scripts were extracted, but the overall structure and heuristics point to a malicious phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=force+mass+and+acceleration+practice+problems+answer+key PDF link annotation
    • http://wexoxunesixu.iblogger.org/88359554844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_6030e76cad207.pdfIn PDF document text
    • https://zakonuvuluj.weebly.com/uploads/1/3/5/9/135984705/linipujadu-totafan-rukilux.pdfIn PDF document text
    • http://kulotaxewupugez.iblogger.org/52351766767.pdfIn PDF document text
    • http://tewepeserero.22web.org/b._ed_application_form_date.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/eGzgiOt/coloring_pages_printable.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/xelimewat/zomopolul.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/nice_script_fonts_free.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/minecraft_tlauncher_1._12._2.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/statement_template_excel_south_africa.pdfIn PDF document text
    • http://mofagadelebedos.rf.gd/wapking_punjabi_hit_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/android_file_transfer_not_working_s8.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_off0000c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC643 5572 bytes
SHA-256: a8f43c2eaddbf6a559b1bf00e95a843671013fcb594b3c339890d3b8d2528552
font_01_sfnt_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10268 bytes
SHA-256: 85f1d8d931958f792a571cacbbe638c47fdddefca030fa7a97996a3ad9c5c6dd

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