Malicious PDF — malware analysis report

Static analysis result for SHA-256 f982bdb8c77cbe73…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 00:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b2229042a1486c78a6e5001fd8aa0ca7 SHA-1: bd0dac7c6f3f3bed8ce4efe09bb10417e94a5ea4 SHA-256: f982bdb8c77cbe73a5ee8abb0b64a0981bb4b71fff0b5a1c071f5037cb4030f9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily truncated, suggests a lure related to academic materials. The presence of multiple external URLs, including one pointing to a potential second-stage PDF, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=inorganic+chemistry+miessler+5th+edition+solutions+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/takoxuwal/ibhcic8/foxuliva.pdfIn PDF document text
    • http://good-production16.site/jean_michael_rapperhsqgw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://dexejajakoto.weebly.com/uploads/1/3/0/7/130739268/xoxeloj.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/jf9e4ge/joxejaxijosipigekatipozi.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/gwjdyUO/what_high_blood_pressure_medication_cause_constipation.pdfIn PDF document text
    • http://specrazreshenie.com/rusepeffhal3.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/adBQUhd/free_ringtone_maker_for_iphone_x.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/zulapubapa.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/2ee1274eb9e.pdfIn PDF document text
    • http://buylettersonline.com/liweworewaweknl7ys.pdfIn PDF document text
    • http://wiinorama.website/fupafatizejivikidoicznk.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/nitidadufetenu/glacier_bay_kitchen_faucet_replacement_valve.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/rapefewisajuzugexolojidur.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_872ebe00c8044506955425f55a084770.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_1a90482a0c0048abb2c4302a6d941d57.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_3e54ce45f5594013921b123b21458d2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/isomorphous_substitution_in_the_octahedral_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/mathematics_dictionary_offline_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/xanofivowe.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/washington_state_escapement_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/the_atomic_weight_of_chlorine_is_reported.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/69065201714.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/ripibewerupegola.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/joomla_free_responsive_template.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5732 bytes
SHA-256: 32c588897b32daf90ec6fa862372f538593cb83cef3fb168fdf576267a0313cb
font_01_sfnt_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 11392 bytes
SHA-256: c851fe7b395c92d18bfb4c0313797ce5f93f0a6d8d862df21fdb930705b13b61

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