Malicious PDF — malware analysis report

Static analysis result for SHA-256 8629ecf899acbb4e…

MALICIOUS

PDF

65.7 KB Created: 2020-12-17 01:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4745736a3f99dc72e36d66d4b0505f1 SHA-1: 1deb98c39b17b6a729a96ffb2c1b11010170f334 SHA-256: 8629ecf899acbb4ecd70a196ec7b43c0adb5b8fb7f30dafcc555e1191ab5b712
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the embedded URLs, 'https://trafficel.ru/aws?utm_term=dental+instruments+study+guide', is flagged as suspicious and likely leads to a phishing or malware distribution site. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/aws?utm_term=dental+instruments+study+guide
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/wulonugav_mozomemozisefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5982e085bf90c0e1d0cdd/t/5fd15ab7ad61ab58317ba0e3/1607555775713/superheroes_car_stunt_racing_games.pdf
    • https://s3.amazonaws.com/tunenijexe/dnd_5e_flames_of_phlegethos_build.pdf
    • https://uploads.strikinglycdn.com/files/1a4d1de1-1a6b-49d6-8b13-14c368c896af/the_happiest_place_on_earth_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/b6ab08cd-06f6-4293-bed3-028a1c0e2861/tajajazimotetugilufepomi.pdf
    • https://uploads.strikinglycdn.com/files/2b3c180f-b2e4-4355-b37b-ce275f7e8e26/nedenexetadamumagik.pdf
    • https://s3.amazonaws.com/sefipa/college_financial_aid_appeal_letter_template.pdf
    • https://s3.amazonaws.com/gixawetopoli/download_ios_app_store_apk.pdf
    • https://s3.amazonaws.com/vunizi/87678433839.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58564f98375720d76c11/1606375512215/career_action_plan_worksheet.pdf
    • https://static1.squarespace.com/static/5fc67bfc104edf1d77a7a5cf/t/5fcb8980393ce473563502fe/1607174529042/duloduxupimirodaburak.pdf
    • https://static1.squarespace.com/static/5fce8e0e799940555acba95f/t/5fd169750f163860c7a2dceb/1607559542206/my_little_princess_movie_where_to_watch.pdf
    • https://uploads.strikinglycdn.com/files/9d86bd02-8877-4af3-98e9-c493257db0f0/80403873369.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3131f3de5e49b52ebca0/1606299954099/72631600487.pdf
    • https://static1.squarespace.com/static/5fc5dc505bcb0228a2a48d66/t/5fcd17e61e1a4d7de130dc79/1607276519798/2018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d6.bin
f7192b089fd8c3e874fc24ed52c60fcf7c82de229cd17f86271f27e2a99353e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 5248 bytes
font_01_sfnt_off0000d3a3.bin
7406fdca81dd8cc78dc4195b0f9bbb7768bd0a51e0bd03f372d73f25fc243711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 12040 bytes

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