Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5b58a5a22ec9f2…

MALICIOUS

PDF

82.8 KB Created: 2021-03-29 06:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 912d7ffd56f42edd39b1c96ef2b2bd6d SHA-1: 20f4de25637d0dd5f828e7182379530a8a198647 SHA-256: af5b58a5a22ec9f2fd3649807af0dc142da63f32c0183f8a92f5c1bcbc79cc56
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to 'audio fx apkpure' and a high-confidence heuristic indicates it's a phishing attempt using an SEO redirector. The primary malicious URL identified is https://jacksth.ru/wix?keyword=audio+fx+apkpure. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=audio+fx+apkpure PDF link annotation
    • http://figixifokemamu.22web.org/swimming_pool_plumbing_design_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/lhghahb/sojojewegibaxamikiwit.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/ijgnVgg/kofogipusalunidaderusiba.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/baixar24_download.pdfIn PDF document text
    • http://rexoduferime.22web.org/what_is_an_example_of_normative_economics.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/48720492161.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/pulujolatepuv/62893943452.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/french_ir_verbs_conjugation_worksheet.pdfIn PDF document text
    • http://guvedizimokid.rf.gd/66210773659.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/sofusesu.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/affairs_cloud_current_affairs_june_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/cambridge_ielts_2_listening_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/ruwarobudoritojiguxugini.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/backgammon_masters_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/how_do_waves_work.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/vmware_workstation_15_free_with_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/60998783695.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/asoka_movie_full_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/gowefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/bizifilezeka.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/bootstrap_form_table_styles.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/29678471446.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/jumbled_sentences_worksheets_for_grade_8.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 4944 bytes
SHA-256: 89d82d39bde9a9cb4e2f0399b2adc4bef4ecf3246050d1fa9d908b3220dfc788
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11372 bytes
SHA-256: 8f818ad0c83759364b3f1b22fa2b280b6925920d5ccbff0156f979f83b94d5ec
font_02_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16192 bytes
SHA-256: eb29371a9263d1efed02b1533fb53138ee823a98fbd078e52407dfdd24d7a728

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