Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf37a39949dcbf7…

MALICIOUS

PDF

78.7 KB Created: 2021-01-11 15:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 40e19c01edc1a79dbb0e34e3e557ac06 SHA-1: 9c5262203b7309b53d91cb2c2bc711595fd23abc SHA-256: fcf37a39949dcbf72694802b178b13dd318979a5419aa37e785c39d5f9164f35
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing lure, as flagged by the PDF_SEO_LINK_FARM heuristic. The presence of an embedded URL and the ML_NYX_PDF_MALICIOUS firing strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior point towards a phishing or malware distribution attempt, likely using embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/123?utm_term=swarovski+return+policy+free PDF link annotation
    • https://site-1172123.mozfiles.com/files/1172123/baby_converse_shoe_fondant_template.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/ZiTAn9r/xugabafisusikafubulosule.pdfIn PDF document text
    • https://site-1174085.mozfiles.com/files/1174085/bejajulunifamobukogadik.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/6779406.pdfIn PDF document text
    • https://xemexavowud.weebly.com/uploads/1/3/1/8/131857479/804361cf8859f07.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/sulavitutonovilasiza.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/j88nShj/music_mp3_player_apkpure.pdfIn PDF document text
    • https://site-1175580.mozfiles.com/files/1175580/cars_for_sale_near_me_under_1000__00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vigevot/femitodusonukixolazojono.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/two_important_concepts_in_archaeology_are_also_considered_deconstructivist.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/banodidanis.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/koporajavolobobis.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/jupezub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 5312 bytes
SHA-256: 0e4dd4b4aed2bba5d42d410067e8ec989e2282719e22057dfe059e156a414799
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 10528 bytes
SHA-256: 97165fab603ad5784e95279c1d03656fdf83698e8c0fb287d4016d98e580b03b
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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