Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d1ac3243c7611c…

MALICIOUS

PDF

87.8 KB Created: 2021-02-19 02:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a7d4018d00f4155cafd384251ca4fde2 SHA-1: 658a060c5be26512357bf1628aa4f56a3864d3b3 SHA-256: 75d1ac3243c7611c15a407129ae6753ea645cfb9871ea5e85a579121766a9801
134 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 URIs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The document body, though heavily obfuscated, suggests a lure related to a '52 week money challenge printable uk', likely a pretext to direct users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/aws?utm_term=52+week+money+challenge+printable+uk PDF link annotation
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/183e53ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5fcc44a9d8951.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/7325723.pdfIn PDF document text
    • http://rudeniwabirever.iblogger.org/jigojizebalapadatoduk.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/xkigjbG/did_the_ball_drop_in_times_square_2020.pdfIn PDF document text
    • https://tovibimatajo.weebly.com/uploads/1/3/5/9/135963052/ludaxegurezawar-nebixonukig-visagi-varevolopipojez.pdfIn PDF document text
    • http://revafazamige.iblogger.org/46989378255.pdfIn PDF document text
    • https://waxujonugo.weebly.com/uploads/1/3/1/8/131871493/47b1b2d48b.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/yhhagd8/nhl_21_release_date_beta.pdfIn PDF document text
    • https://sivoroxusakigob.weebly.com/uploads/1/3/1/4/131453081/monomimez.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/iaShbgc/hungry_dragon_wiki.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/clumsy_ninja_hack_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soxidavalib.rf.gd/free_google_chrome_version_75.pdfIn PDF document text
    • http://sefogubijisep.epizy.com/povijobirosurofod.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/bootstrap_4_template_free_admin.pdfIn PDF document text
    • http://wafalox.rf.gd/82505394969.pdfIn PDF document text
    • http://jibufunipibavu.rf.gd/athens_georgia_weather_report.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 5728 bytes
SHA-256: 587e0cedbfad10cb07f1e60c91ff23bdd0da14dfb1e14e895d2345659fd5b2a2
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 11220 bytes
SHA-256: a4db7cf5bb4d8fe848c72986f0daf0bc7c78a75cc426ab37b85b5cd976e08223
font_03_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 16080 bytes
SHA-256: 7f85b26e62eba69146dc7438ff276137e072823ff9fd45ab382834de6c431daa