Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb94f89b02049c4f…

MALICIOUS

PDF

75.9 KB Created: 2021-02-18 23:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5ec1430d0397c1b495507e1bf59e5f3e SHA-1: a1c3100756ca942315a31faa8001e89a73c4079c SHA-256: cb94f89b02049c4f8c7b3a75bc0a636657b9e89f287bb25f2fc03a5fae734739
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. One of the extracted URLs, 'https://druttle.ru/wix?keyword=geologic+time+study+guide+answers', is likely part of a phishing or SEO spam campaign. No scripts were extracted, but the presence of many external links suggests a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://druttle.ru/wix?keyword=geologic+time+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/gimanoretev/hiKhdHo/ruxurumilepo.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/nifide_daradanimig.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/agfgjhb/72604394136.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hb7zghv/fepom.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/lC55ngg/potabavugunumoriv.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/kgfgfGq/whatsapp_status_video_download_in_tamil_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/ijgeggh/healthy_eating_tips_for_young_adults.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/pabesojuwodifulapa.pdfIn PDF document text
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/bixabizozi_vilezojeduwomaj_vuluro.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/6VgQiaw/electricity_meter_reader_device.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/issH7VZ/all_star_charity_cricket_match_date.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/dOT0gg3/panda_cube_smash_how_to_spend_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/9J0sMgg/neloxajimi.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/qiaggha/gaburazi.pdfIn PDF document text
    • https://tuzidatawuno.weebly.com/uploads/1/3/4/9/134902979/rododej.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/femalum.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
    • https://s3.amazonaws.com/mexijegedakol/bteb_job_circular_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/61469767274.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/formal_anchoring_script_for_seminar.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/69106450542.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/dls_19_brazil_profile._dat.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/62754197561.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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 5364 bytes
SHA-256: 82966630c9cfaf63f550e1c16c39b8ea55ef642a3408541a6a0d5878a46bc212
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10504 bytes
SHA-256: 25f4663212adfd4d66127767873f00145304b676c6c675fb9ee0772594e96970
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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