Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c505596df0ab24…

MALICIOUS

PDF

71.6 KB Created: 2021-01-24 10:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb5bafbbdfa2927410574543dc1ffeed SHA-1: cc3fe5c1b8cc0ffa9ce18a15910782fb6353f168 SHA-256: b9c505596df0ab24ba8160622028e4f4e2188e21b341482662da1c21bfc53084
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF acts as a link farm, directing users to various disposable domains, one of which is specifically advertised as a download for 'bridge constructor apk free download full version'. This suggests a phishing or malware distribution attempt, likely using a social engineering lure to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/wb?keyword=bridge%20constructor%20apk%20free%20download%20full%20version PDF link annotation
    • https://cdn.sqhk.co/roxigeve/5EL2w1t/episode_choose_your_story_main_characters.pdfIn PDF document text
    • https://site-1174578.mozfiles.com/files/1174578/bucket_list_travel_agent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_600cf57e22995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5fec675d71ef2.pdfIn PDF document text
    • https://site-1177542.mozfiles.com/files/1177542/biotecnologia_industrial_volume_4_ebah.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/applock_open_without_password.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503387/normal_6000715b5f7b9.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/dTiiide/56944790929.pdfIn PDF document text
    • https://site-1171687.mozfiles.com/files/1171687/33460813524.pdfIn PDF document text
    • https://site-1168098.mozfiles.com/files/1168098/scrabble_game_for_windows_10.pdfIn PDF document text
    • https://site-1177630.mozfiles.com/files/1177630/my_talking_tom_friends_mod_apk_ho.pdfIn PDF document text
    • https://site-1168209.mozfiles.com/files/1168209/67253284730.pdfIn PDF document text
    • https://site-1186874.mozfiles.com/files/1186874/pusoduxidagezazuxoxerel.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/3FjgPgd/sound_analyzer_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwugufufokiti.epizy.com/meddev_clinical_evaluation_report_template.pdfIn PDF document text
    • http://vikogen.epizy.com/humble_neogeo_25th_anniversary_bundle_free.pdfIn PDF document text
    • http://goguvero.epizy.com/turkish_march_piano_sheet_imslp.pdfIn PDF document text
    • http://kotasogova.rf.gd/jowozatonubonovegiv.pdfIn PDF document text
    • http://xitemefunugege.epizy.com/rokawap.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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 5588 bytes
SHA-256: c17c3148be265d2787d5bb5978baaf442bfb3dc22c379843af91ad0c04b60964
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10348 bytes
SHA-256: ad5c7aa0eb1be51de9f6bd9d13496b4be927a45023d9e05363e0c5ff4b2f3706

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