Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dc50eeb09c2ced…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 18:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34c7c93d38dda6eeab4116d1853c3c9b SHA-1: eddc7aafffb93415465491338ebcf0a12e27ac82 SHA-256: c2dc50eeb09c2ced34dad056b10f9734f447cddeb574d484a222647bb72a4ae1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or redirection attack.

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://mezovuduw.ru/award?keyword=alexander+technique+free+pdf+download
    • https://subinekole.weebly.com/uploads/1/3/2/6/132695692/zuzolujepekif.pdf
    • https://subisadorug.weebly.com/uploads/1/3/1/6/131637552/lonodejas.pdf
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/duwebum.pdf
    • http://jupomolitage.22web.org/jam_touch_wireless_speaker_manual.pdf
    • http://lexidubug.22web.org/annual_general_meeting_companies_act_2013_format.pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/zawixumenox_nozofex_xutozipawele_niretago.pdf
    • http://zebinoleruf.iblogger.org/what_size_should_a_brownie_be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixamupelinere/97579992250.pdf
    • http://lokezore.rf.gd/82055448966.pdf
    • http://lusujukelod.epizy.com/14555546162.pdf
    • https://s3.amazonaws.com/midaguvimabof/intermunicipal_collaboration_framework_template.pdf
    • https://s3.amazonaws.com/xotomisen/at_t_u_verse_guide_zoomed_in.pdf
    • http://kodexogezetegir.epizy.com/best_golf_gps_for_apple_watch_4.pdf
    • http://dokaxemimagi.epizy.com/how_to_know_if_refrigerator_thermostat_is_bad.pdf
    • https://s3.amazonaws.com/pavujiniz/plantronics_c054_user_guide.pdf
    • https://s3.amazonaws.com/kotodur/naruto_shippuden_ninja_storm_4_apk.pdf
    • http://xumametubedax.rf.gd/fajovawu.pdf
    • https://s3.amazonaws.com/vasofirida/zewuwewonujak.pdf
    • https://s3.amazonaws.com/mejawiwomak/88484626756.pdf
    • https://s3.amazonaws.com/liguwubore/siveforeb.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_off0000f927.bin
1081c60dab66198ddb15818ef61fde76fc2d5d3e855e242772e50b4d74150b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 5340 bytes
font_01_sfnt_off00010b66.bin
fbd18160debf677fb765dc9a89843b189467f897ccd38808e97bbb43bf1ac6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 10928 bytes

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