Malicious PDF — malware analysis report

Static analysis result for SHA-256 f685def152e895fa…

MALICIOUS

PDF

69.9 KB Created: 2021-03-23 03:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 157df22a8490735b82b6313a8e07286e SHA-1: 13f52a5f34d23539d672beefdb43b31af02464e6 SHA-256: f685def152e895fadec4ab607d1f2181bf7849b6b5d820e01e7f0d8630c76402
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to disposable hosting services, disguised as a solution manual. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy on disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=hydrology+and+hydraulic+systems+solution+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/motulobugaji/fLjiLgd/39582425137.pdfIn PDF document text
    • https://cdn.sqhk.co/roduxokixuzi/HjgoWhe/84476986448.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://kabibejago.weebly.com/uploads/1/3/6/0/136050231/f1000e23.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/5649425.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/maths_app_graphing_calculator_pro_apk.pdfIn PDF document text
    • https://gikapizuwixa.weebly.com/uploads/1/3/4/0/134097763/820ce07001ace.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/idtibjf/72621261808.pdfIn PDF document text
    • https://vameduxa.weebly.com/uploads/1/3/4/6/134664578/c6992.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/7157894.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/b77297bd1ff484.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/fusamo_tufuzogalo_domatibixubudo.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/zuwalawavulozi.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/hcheynD/mega_mall_story_2.pdfIn PDF document text
    • http://womumonafip.22web.org/goodreads_apk_apkpure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e1e4aa-d212-4478-b7bd-57be5b79eb4e/jump_force_characters_dlc_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/award_certificate_templates_for_elementary_students.pdfIn PDF document text
    • http://rekujub.rf.gd/jacopone_da_todi_donne_de_paradiso.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/recognizing_lab_safety_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769f087b-a47c-4dc1-9abe-ce16c265aaa0/vegan_meals_for_fussy_eaters.pdfIn PDF document text
    • http://zadaxuro.rf.gd/70023869601.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/are_ilive_speakers_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ffb996-701d-40e8-b1d4-ea282c996c07/38728981197.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_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 5632 bytes
SHA-256: 7c73375f4f3bcdecaf8306ab1fd11063dafd0ce2e2283b1370631937197227fa
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 10232 bytes
SHA-256: 0f3679f99ad6ee40f080b5b1e95b07f3eccaa18a4e8a97172427a910ad7d9f86

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