Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac0533a0c5827a…

MALICIOUS

PDF

76.6 KB Created: 2021-02-25 08:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c819ea4dfc87c2d7b1780f16b91819a SHA-1: 5abf02208e0d87c9c5fb6e6ea9661f6746867c1b SHA-256: b4ac0533a0c5827a6ac3385292f968903b0ab48e2eab5ba944ee08c81b75659e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily garbled, appears to contain technical terms, likely a lure to disguise the malicious nature of the links.

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://druttle.ru/aws?utm_term=omron+hem-7120+automatic+blood+pressure+monitor+specifications PDF link annotation
    • http://ragukir.iblogger.org/what_does_quarterly_report_means.pdfIn PDF document text
    • http://intekzafast.online/gosport_war_memorial_hospital_report_2018ahkcg.pdfIn PDF document text
    • http://gvidilon.ru/dowujorifotesfhtii.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/super_mario_bros_2_3ds_star_world_3_star_coins.pdfIn PDF document text
    • http://mukatadirez.iblogger.org/birla_sun_life_insurance_kyc_form.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/anti_ragging_form_aman_movementq9g11.pdfIn PDF document text
    • http://fruittea.space/326831354245p4zn.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/ultronic_clock_radio_instruction_manual8l642.pdfIn PDF document text
    • http://madewithsunshine.com/sivafilufodidipuqe972.pdfIn PDF document text
    • http://rebujeboxuveme.iblogger.org/love_story_song_lyrics_telugu.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/budesajav0v4c5.pdfIn PDF document text
    • http://jegagavakunumog.iblogger.org/muvuvijuruposevimifewogix.pdfIn PDF document text
    • http://csxmoney.info/koxoritut6kbzj.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/breast_cancer_screening_guidelines_20185e9ou.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/vufupu/chinnari_mutha_kannada_song.pdfIn PDF document text
    • http://nexuxawire.epizy.com/unifi_ap_ac_lite_controller.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/corsair_cx750m_cable_compatibility.pdfIn PDF document text
    • http://foboganezebalo.rf.gd/glassworks_opening_piano_sheet_music.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/wilorane.pdfIn PDF document text
    • http://nomekerileme.epizy.com/37087557818.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 6000 bytes
SHA-256: d948b604aebeee7530f93dfc78040c1787a0b2321ba2cd04bc5f588840334454
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 11516 bytes
SHA-256: 405e3f995e59af3d037137f2bd59d69b8d99b3bcd30d9515598ed939f51ac6d7

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