Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa92c36c6751f645…

MALICIOUS

PDF

80.1 KB Created: 2021-02-25 17:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4936d36b89163a90887de9855c73e83f SHA-1: 104058f60e9ea78b2742e63947de6dca91b520be SHA-256: fa92c36c6751f645206e589ad1436622743e1585a897d9ea8d0bdac42f716dac
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/123?utm_term=onkyo+tx-nr616+no+surround+sound PDF link annotation
    • http://sowopezamiw.medianewsonline.com/why_is_h2so4_a_stronger_acid_than_h2co3.pdfIn PDF document text
    • http://migerov.xyz/pioneer_sx_950_receiver_amplifier8ydxe.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/how_to_treat_adderall_withdrawal.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/9825105.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/32d1f9de3f6c.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/1879594.pdfIn PDF document text
    • http://worldhold.online/new_public_management_theory_ideology_and_practice80tlc.pdfIn PDF document text
    • http://reduslim-italia.website/make_your_own_apple_music_playlistnbuln.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/0775fa.pdfIn PDF document text
    • https://pewepexit.weebly.com/uploads/1/3/4/6/134659954/wisediminixar.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/natewared/bamep.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/38711219307.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/ionic_side_menu_template_tutorial.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/the_boy_in_the_striped_pyjamas_quotes_gretel.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/4098893496.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/mastering_plugins_for_fl_studio.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
    • 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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 5076 bytes
SHA-256: 0410752de1a5e71f3c3d8b745415f6a4ac9e6b610ffd17ff1590b09488b9ffe8
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 11120 bytes
SHA-256: 6c5213b951dff5adc0b961bda2260b46f52f2480b8f598845f54894762d76a84
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 16084 bytes
SHA-256: fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3

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