Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ba14d0afe084e…

MALICIOUS

PDF

74.5 KB Created: 2021-01-24 01:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3befb17ef74a016b18ac386f0d1828f SHA-1: ebbbfa78d3e411d333f1bc3ec0d7ff8c6d78668e SHA-256: b66ba14d0afe084e07353c4171ca102edfedd3e1c399b0e355f90be166161cd9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, and one URL is explicitly identified as a link farm. The document body, though heavily obfuscated, contains references to 'newsletter templates mailchimp' and the authoring application, suggesting a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=newsletter+templates+mailchimp
    • https://site-1211292.mozfiles.com/files/1211292/duzotedamufavu.pdf
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5fc68a59b97fc.pdf
    • https://static.s123-cdn-static.com/uploads/4366027/normal_6002547fe0c3e.pdf
    • https://site-1175317.mozfiles.com/files/1175317/diners_club_international_card_activation.pdf
    • https://site-1248249.mozfiles.com/files/1248249/guided_sleep_talk_down_to_rain_sounds.pdf
    • http://rebujewemiv.66ghz.com/textview_vertical_align_center_android.pdf
    • http://vifijes.22web.org/64733324672.pdf
    • https://mawakizuk.weebly.com/uploads/1/3/0/7/130775730/tupebekivogokavedo.pdf
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/9889a.pdf
    • https://site-1176940.mozfiles.com/files/1176940/48748896910.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/rasulepi.pdf
    • http://lesanuzununefa.22web.org/ruzutepasagazolelikesuxud.pdf
    • http://gabubixaj.22web.org/92371647535.pdf
    • https://veraxoli.weebly.com/uploads/1/3/4/0/134040716/9639303.pdf
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fc7d23f812b9.pdf
    • https://site-1247446.mozfiles.com/files/1247446/44251700021.pdf
    • https://jagavovukivotu.weebly.com/uploads/1/3/4/8/134881855/51a736488b88.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/60221707200.pdf
    • https://s3.amazonaws.com/vifusupegiza/whatsapp_messenger_2018.pdf
    • https://s3.amazonaws.com/nezanurugega/33923760038.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e1.bin
5b7fa54eb8471bc181241534023407f445aa8dddc569636c288c630e3e1c36a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 5232 bytes
font_01_sfnt_off0000f88e.bin
4b5bbf9078499ac043a2a0aa4aa535a2e9e210e1082da797bdfb83e38c734662		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10736 bytes

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