Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40da7d034ad38d2…

MALICIOUS

PDF

70.9 KB Created: 2021-03-15 15:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2325cb177f39455d2278f993ebe74db SHA-1: 5d28a85297f8fc96072c5afb47c2a2e44ef285d9 SHA-256: a40da7d034ad38d2c748af92a7e5d7f441d0c20784879bed8ac3238a697a07c2
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://maypoin.ru/award?keyword=fundamental+of+english+grammar+pdf+download PDF link annotation
    • http://bcpzonasegur4viabcp.com/bypass_paywalls_firefox_androidxbet3.pdfIn PDF document text
    • http://thefortykuti.com/xonunomatizixifed1kukb.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/bilimudab.pdfIn PDF document text
    • http://rabota-plus.club/personal_pronouns_and_possessive_adjectives_exerciseghvg5.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/computer_application_in_mechanical_engineering.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/39592132907.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/6852156011.pdfIn PDF document text
    • http://iciko.xyz/free_convert_paint_to_word78uc1.pdfIn PDF document text
    • http://mejudibeteminit.22web.org/sobamubi.pdfIn PDF document text
    • http://pro-konditer.com/how_do_i_adjust_my_g_shock_50813qpif.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/toro_power_clear_721_r-c_oil_type.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/9f5f8abe-7386-45be-9a97-4b0f95bf9ecc/dotorunutekotibizonapunuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acfbfe1-3f1a-411f-9b4b-145b6c6dd901/maths_basic_formulas.pdfIn PDF document text
    • http://rofixalo.epizy.com/gometojezanepar.pdfIn PDF document text
    • http://gametusepezuka.rf.gd/putowitimivusegomufud.pdfIn PDF document text
    • http://vugovule.epizy.com/bukegewazorufirofej.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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 5500 bytes
SHA-256: 8042d07fcaf6ff232de5c9e938539d5675801117647048c67bc34fca7cbcc770
font_01_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 19788 bytes
SHA-256: e4861048dbcaedb4847925e34c3670f828ed202f41701bd0a588043a6e26406a

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