Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d104b6a3bba1b8…

MALICIOUS

PDF

71.1 KB Created: 2021-02-05 11:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ada7d256c09add107a0a68416b90b5ca SHA-1: 21af7a7f82c2612cf01de5f80ff3c2d9916c13fc SHA-256: 70d104b6a3bba1b89c094ece2ac31d6633eeedeea55b850b8b3d36f40dbf5fc8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. One prominent URL, 'https://jottigo.ru/aws?utm_term=chennai+corporation+community+certificate+application+form', is presented in a context suggesting a fake application form. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

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=chennai+corporation+community+certificate+application+form PDF link annotation
    • http://lovunusugi.22web.org/chopin_ballade_1_g_minor_sheet_music.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/00d0c94da2732d.pdfIn PDF document text
    • http://powerhdniy.space/blender_2._8_manualagdql.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/vukumozizevemiva.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/aogfdpL/83678012678.pdfIn PDF document text
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/tibasadabu-pazekowugoged.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/lupuwilim.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/gggej9K/song_association_game_quiz.pdfIn PDF document text
    • http://raifaisentgo.online/98765395619pl5qs.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/midogikifugokibitexo.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/hHhbghQ/sijadijageletesosu.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/EO4hbib/rowinawo.pdfIn PDF document text
    • http://gloslides.com/ludo_classic_board_game_free_dice_board_games265pf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/aerobic_step_platform_where_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/fiwufafolujexuwe.pdfIn PDF document text
    • http://pukadevimetuz.rf.gd/hssc_lab_attendant_online_form.pdfIn PDF document text
    • http://wekijedi.epizy.com/38911518225.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/dka_guideline_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/rumanuwefetukosu.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 5084 bytes
SHA-256: da053c311f391bd0db508523e2e61014554d848a7134501fc60c8acd4dce925b
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10084 bytes
SHA-256: 6169be4a66a323ccd3453054a4421b869b9d50fa1b658e49caf3d742d1a1a0e1

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