Malicious PDF — malware analysis report

Static analysis result for SHA-256 479242ba479b4126…

MALICIOUS

PDF

82.9 KB Created: 2021-02-14 08:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 699cbbbcba9ff077a35975889c1a5449 SHA-1: 667f419edcd71a9e6f2eb60e3df7a7188e18a989 SHA-256: 479242ba479b41269bf9e819bee56b241bcd159769bf7d54f1a80dc63e53c5d0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, including one pointing to 'jottigo.ru' which is associated with a worksheet lure, and another to 'lnstagrambusiness.com' which is part of a link farm. The presence of these links suggests the document is designed to redirect users to potentially harmful sites for phishing or malware delivery.

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://jottigo.ru/aws?utm_term=helpful+and+harmful+microorganisms+worksheets PDF link annotation
    • http://lnstagrambusiness.com/carrocerias_ganadeiras_molas1ruwl.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ji1qzJK/panda_bear_bubble_game.pdfIn PDF document text
    • http://shopyou.online/l2d99.pdfIn PDF document text
    • http://naturmilans.fun/53605060546pv85h.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/do3PoSd/knightfall_arkham_knight.pdfIn PDF document text
    • http://gmetry.online/17868705070jjlrn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5ffcc671020c8.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/830TEUj/allen_theaters_clovis_nm_movie_times.pdfIn PDF document text
    • http://copyrightshelpscenters.com/catalogue_spark_models_2018wsfed.pdfIn PDF document text
    • https://cdn.sqhk.co/towitudamuga/hhSdigc/spiral_christmas_tree_yard_decoration.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://semisoriguregix.epizy.com/fezopejumoda.pdfIn PDF document text
    • http://tujiritam.epizy.com/68463783434.pdfIn PDF document text
    • http://birofasadonu.epizy.com/59827553152.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/acr_call_recorder_apk_3.pdfIn PDF document text
    • http://fopekexu.epizy.com/nadudutamojipizikonu.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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 5684 bytes
SHA-256: 3d04b4cf3217906e8da39fcdf313eadb1153645889dcfac7b69d6b4d1adc1934
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 14308 bytes
SHA-256: 55361912e9d2b0879173177de5b6a20192035de706121c0662f68732e8da87aa

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