Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c745d633bf32a59…

MALICIOUS

PDF

80.8 KB Created: 2021-03-29 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0357a92f9d7df39db0e2dec797c8f857 SHA-1: 5448b1c6170aff4bf7e4f0e64b85f745699f3853 SHA-256: 0c745d633bf32a59b3eb7ae5fe9dcdb5124af229afb2058b5393804ce66c01a3
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 0.9998

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://ponafet.ru/award?keyword=advanced+curriculum+development+pdf PDF link annotation
    • http://italiahot.fun/66804442938r5xu8.pdfIn PDF document text
    • http://dodisof.iblogger.org/character_traits_list_3rd_grade.pdfIn PDF document text
    • http://romeital.space/que_es_un_lider_cristianohy7tr.pdfIn PDF document text
    • http://rivalo130.com/how_do_i_set_the_correct_time_on_my_fitbit_charge_hr5ppm6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60018ec7db149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450244/normal_600449a061277.pdfIn PDF document text
    • https://cdn.sqhk.co/milatepoz/haphjgd/picowords_answers_level_6.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/pVYdibC/36525215151.pdfIn PDF document text
    • http://kismykeitio.best/wilderness_survival_essentials_list0wys1.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/international_journal_of_sports_medicine_impact_factor_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_604d3fbad3cd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumesuzev.epizy.com/90523983786.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/what_is_the_message_of_the_wife_of_baths_tale.pdfIn PDF document text
    • http://medipebep.rf.gd/51659319430.pdfIn PDF document text
    • http://givetupazowo.onlinewebshop.net/causes_of_inflation_in_ghana.pdfIn PDF document text
    • http://kizaseridofe.rf.gd/rowdy_baby_video_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/chieftains_the_long_black_veil.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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 5172 bytes
SHA-256: 739cb8f42423fea99fc872637462293cf06e88dec49895a72c7bc0c454a7f04d
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10296 bytes
SHA-256: 0f56b92bf1a5eda6c5300d8ed6d91c4a6e903646b86182ae4ffb2f5178bc5faa
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 16352 bytes
SHA-256: 7cc7167fdbdae089fde97de433806e345e14acb09bff53824b20019e817c1eea

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