Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a64910aa46a8e4…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 05:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4543ba0716f3f283da32eb041ebf41f6 SHA-1: e70d5765af73dee8467f23f298a79e17bd204820 SHA-256: a8a64910aa46a8e43bf9ed2e2b5258f1c3165560f05b2e91734dff1f422580e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=what+is+rudram+chanting PDF link annotation
    • http://retenenu.iblogger.org/english_grammar_translation_to_tamil_free_download.pdfIn PDF document text
    • http://andyhong.blog/62156966329wu2tf.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/risupujev.pdfIn PDF document text
    • http://help-verification.com/aristofanes_las_aveshi1kf.pdfIn PDF document text
    • http://sedouche.xyz/54129982353ymjww.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fe03a0c67490.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/2a0788.pdfIn PDF document text
    • https://kipewupariwigel.weebly.com/uploads/1/3/1/3/131379586/a90090e5b04.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/maths_number_puzzles_with_answers.pdfIn PDF document text
    • http://avto-document.site/class_d_water_license_practice_testcbol9.pdfIn PDF document text
    • http://wspring.space/download_granny_chapter_2_outwitt_mod_apkb2tn8.pdfIn PDF document text
    • http://termometr-medikal.site/vilujafijol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_602c44eeb2904.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/86143209823.pdfIn PDF document text
    • https://gemirolav.weebly.com/uploads/1/3/1/6/131606407/7a3704af4.pdfIn PDF document text
    • http://workshop-fb.ru/14086437036lktlz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_605001e2f412c.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/cbdb1c5.pdfIn PDF document text
    • http://flowerport.store/how_to_repair_black_and_decker_steam_ironbic5g.pdfIn PDF document text
    • http://jezopapurowejen.22web.org/antivirus_app_for_android_phone_free.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/sandisk_clip_sport_8gb_mp3_player_-_pink.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://wefixewixe.rf.gd/synthetic_seismic_data.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_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 5336 bytes
SHA-256: 1a96672276d2da778e7db0516fab3bb0b91eb11812b0cfc7f8b688087af8ab2a
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11896 bytes
SHA-256: 5eb4a9b0426f115bbfcd209e75f00a1136d327c85771d0069405e844a4c2d9d7
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 3304 bytes
SHA-256: e63577ce3bfb72d9c2cf9ef287ca1a2058ec6bcb7e95d6c1a41e2885975df61a

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