Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d2e49662a5e4f0…

MALICIOUS

PDF

71.1 KB Created: 2021-03-15 20:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7937090881e49670f1c3e3f29a468be1 SHA-1: c715673cc38ccfc8fba8bb0fc22628b0e6e170b2 SHA-256: b4d2e49662a5e4f09e3983d0d981cdd6d40636cc3230a2735ea62511e59c4335
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'barbecue recipes pdf free download' and a URL pointing to a similar theme, suggesting a phishing or social engineering lure. The presence of external URIs and a link farm heuristic further supports the malicious nature, likely serving as a downloader or redirector for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xezojetit.ru/award?keyword=barbecue+recipes+pdf+free+download PDF link annotation
    • http://design-kvartira.info/jevuxefibunuwesuwesuwysc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_604505ccc145c.pdfIn PDF document text
    • http://sks-expertiza.ru/2006_honda_odyssey_serpentine_belt_tensioner_boltamzm9.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/kawite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_5ff0b4f7dc08c.pdfIn PDF document text
    • https://jivetekerujurar.weebly.com/uploads/1/3/2/6/132695216/jiditobifilejeselo.pdfIn PDF document text
    • http://jukejed.mypressonline.com/86525189934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6047f24c3e97f.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/bazakodajesalojixiside.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/super_mario_bros_deluxe_switch_2_player.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ffc6b6ea2e3a.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/jjhcNgc/game_hot_wheels_infinite_loop_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601e75377ee7e.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/61b19bbb164c42.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/fosej.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/hiHhjID/vsdc_free_video_editor_windows_10_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/salirigap.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/mittlere_nderungsrate_aufgaben.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 5432 bytes
SHA-256: c5f75f7c963dea5f01e24567ed0f09d6ea043d8c1a2de9d0bb65ca0ff751c821
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 11284 bytes
SHA-256: 2dba7208f547844ca3dab7983c808714f52762d31d30879254e65194d7f294b6

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