Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d64030a994e406…

MALICIOUS

PDF

74.9 KB Created: 2021-01-31 10:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 177fd3ada127ad8cac15a46458f78c1f SHA-1: 48af16713c71fe433f0496cf529d95c819716586 SHA-256: 93d64030a994e4067a6557fe34952192f446c9a7b27243b918dd648a9b20cee1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable or suspicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, suggests a lure related to mathematical functions, which is likely a pretext to drive users to malicious external sites for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/123?utm_term=points+of+discontinuity+in+piecewise+functions PDF link annotation
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/006bbc4c.pdfIn PDF document text
    • http://erogan-encolumbia.site/403846077202b6sk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5ff3807eb8fd7.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/3688728.pdfIn PDF document text
    • http://magicwoolshop.com/watercolor_splash_background_tattoo2ofw6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fec514fbd7c9.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/4835542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ffd496c8b794.pdfIn PDF document text
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/wubalujowux.pdfIn PDF document text
    • http://runolive.com/salesoxulamuualjb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff2dcf4d9db1.pdfIn PDF document text
    • http://mosasekoz.22web.org/72597871579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5fddf56b9c94f.pdfIn PDF document text
    • http://zajegipu.22web.org/35606944681.pdfIn PDF document text
    • http://mmeueue.space/stumble_inn_upper_east_side_nycqs2kz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakafadudu.epizy.com/92960509904.pdfIn PDF document text
    • http://losaxoxajav.epizy.com/axiforma_font_family.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/xibuduwufutawalof.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/22294671325.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/airplane_pt_2_piano_sheet_music.pdfIn PDF document text
    • http://kujafugakare.epizy.com/nicki_minaj_hot_summer_girl_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/gijigegijusezi.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/cbt_challenging_negative_thoughts_worksheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5004 bytes
SHA-256: b0127cc4ab8544a85ee08235b8a3bf1da87e48e336dd52b752c0a2429de94ef5
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 11420 bytes
SHA-256: 4c736d5cdb58658ed3f9d9a39579f2182cfc982fb3c856b839b261cca6a10367

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