Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac919cc7662d77c…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 05:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1337abebeaf331a1cd0a29d163479ef0 SHA-1: b9f2810f3adb2572bc9249dfa3e4a84a2ab00b26 SHA-256: fac919cc7662d77cc96a3e4d51c2ba9a3dcc0400ac677333a3d20ff996d416d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to 'aptitude questions and answers for computer science engineering students pdf', which is likely a pretext to direct users to malicious sites. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=aptitude+questions+and+answers+for+computer+science+engineering+students+pdf PDF link annotation
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/vusivolonewav.pdfIn PDF document text
    • https://nonikezit.weebly.com/uploads/1/3/4/3/134335915/6940676.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/yheDqge/29984735606.pdfIn PDF document text
    • http://moneymaya.site/is_a_motion_to_dismiss_a_responsive_pleading_arizonal4kpj.pdfIn PDF document text
    • http://bio-ita.fun/manodosuzugl6q2.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/75833b04940.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/cdk5L9I/34404323867.pdfIn PDF document text
    • https://cdn.sqhk.co/lesebonun/kBlWihb/vidikidofo.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/cpicgM3/crafting_idle_clicker_strategy.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/bd486c06.pdfIn PDF document text
    • http://canonsburglake.org/cool_outfits_assassin_s_creed_origins1hnmd.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/gasowiwelemapav-bipekez-kufazezo-bakajizo.pdfIn PDF document text
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/1327571.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/9Qzib3k/lofulenezasiduwejaru.pdfIn PDF document text
    • http://uspeh.icu/enzyme_kinetics_tyrosinase_lab_report8mupr.pdfIn PDF document text
    • https://lipazugarajoko.weebly.com/uploads/1/3/5/3/135318447/e72b7533c.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
    • http://funurebebepoti.epizy.com/summer_acrostic_poem_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/1678595687.pdfIn PDF document text
    • http://gosizabogabam.epizy.com/34386246644.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/sql_developer_nls_parameters_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/gopro_hero7_silver_4k_action_cam_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/laxokumid.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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 5532 bytes
SHA-256: b33e759251f22b6f3416e6e321469ba731533bc3dc7604ba749b78cb9fff5b8d
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 11064 bytes
SHA-256: 1169dfdef19798da448e0a694888f69da59c96efbb103855c22c12045a9f3f66
font_02_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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