Malicious PDF — malware analysis report

Static analysis result for SHA-256 b794ccb1688fc576…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 10:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 0a4652225d3d7b831563bf4042654faf SHA-1: 8acec1a6c8d506f9780fe0b02377f0962e53b26b SHA-256: b794ccb1688fc5764832680ee824d9da050cfb9410cd3fb42abd369fdb7dec0c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://jacksth.ru/strik?utm_term=what+are+the+different+types+of+contrast, is likely a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=what+are+the+different+types+of+contrast PDF link annotation
    • https://cdn.sqhk.co/ranotigu/fgcgesK/mikecrack_wallpaper_full_hd.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/40584273794.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/degusakisiwim.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/radioactive_waste_disposal.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jdljeha/32440346814.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/bQjgwhc/train_sim_2021_mods.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/navneet_dictionary_english_to_gujarati.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/suunto_ambit3_watch_band_replacement.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/78769339369.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/bhagwat_puran_sanskrit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/bodmas_questions_for_grade_6.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/board_game_rules_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/9915969969.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/microsoft_excel_worksheet_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/79134149878.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_f2d9690a56254aeb8d9fbfdc2f58ec24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/28434707558.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/forarulamifiv.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_8d1c21590ec64abaa72715ab264b1cb7.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_740c6b17a8e44569a648e452bb25a48c.pdf?index=trueIn PDF document text
    • http://wesatume.atwebpages.com/understanding_learning_disabilities.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/atomic_theory_and_the_description_of_nature_niels_bohr.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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 5324 bytes
SHA-256: 81f42137b4d2e0c15c53dfae93989bf79e5589029c77d6f146095f5c4aeae045
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 10832 bytes
SHA-256: 527717aa662d915888d42e77b158e21b1569f3548667c8584a59c40cc901f69d

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