Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8c25fdd0183df3…

MALICIOUS

PDF

96.9 KB Created: 2021-03-15 05:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d8d1a1c44d8ebd3b9f63dedf2397123 SHA-1: 726db13a8ce4b15bf87213fed362009d21278379 SHA-256: bb8c25fdd0183df37ad573a9cef825fbe3baf49f079232f42e26e47f45023ba4
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO redirectors and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=la+amortajada+analisis PDF link annotation
    • https://sirunolova.weebly.com/uploads/1/3/5/3/135303996/2815901.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/negatus.pdfIn PDF document text
    • http://mscgis.net/acer_v5-132_bios_keybi21h.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/c1d0fd597f4d.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/terewobulubegif.pdfIn PDF document text
    • https://zodukaveg.weebly.com/uploads/1/3/5/3/135345947/6064124.pdfIn PDF document text
    • http://gufutaca6.xyz/clash_royale_free_gems_and_goldp4q25.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/Xgjjhds/47537967792.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/j1hhgea/fojodetowo.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/3hjjjEF/ikea_chairs_living_room.pdfIn PDF document text
    • http://girlsbeach.space/wikaxan0lf9m.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/M1ghJJn/zombie_target_undead_trigger_survival_shooter_fps_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/g4HweKN/carrefour_pass_app_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jimugivos/comparison_between_administration_and_management.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/music_alarm_clock_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/antivirus_kaspersky_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/adafruit_motor_shield_v2._3_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/89914473170.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/happy_birthday_cake_bunting_template.pdfIn PDF document text
    • http://bituxezemas.epizy.com/97667629458.pdfIn PDF document text
    • http://wibutena.rf.gd/38264779173.pdfIn PDF document text
    • http://zinezalidoratov.rf.gd/98474018816.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/define_strict_constructionism.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 4660 bytes
SHA-256: 299e6a8a12fc163b8ceb7d44701279409effa30f9adb24df7dbb333365cd9d85
font_01_sfnt_off00014240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14240 11540 bytes
SHA-256: fe263a4e9dcc00533776c66f08e8d27f1ec1ca272c9589820ab3b90030a862b4
font_02_sfnt_off00016815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16815 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2