Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa7e9f1ca79aa6e…

MALICIOUS

PDF

91.8 KB Created: 2021-05-06 11:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 991c1e88aa44a2333248819f8b1c4d44 SHA-1: f3d6a93d103d969dabaa6abc0fe642995707a8bd SHA-256: efa7e9f1ca79aa6e60e1343c46a92930cc2db4b01370d61bbeec35390662004b
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified as a link farm. Heuristics indicate this PDF is likely a phishing or malware distribution lure, as confirmed by ClamAV detection. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=ge+turntable+microwave+oven+jes738wj02+manual PDF link annotation
    • http://rumigiwataj.getenjoyment.net/advanced_exercise_physiology_book.pdfIn PDF document text
    • http://nuzoxej.iblogger.org/abc_alphabet_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/nupijazas/6geQ3Ui/explain_marketing_information_system_mis.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/dumping_and_antidumping_measures.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/how_to_program_remote_for_liftmaster_myq.pdfIn PDF document text
    • http://pizetagudagunox.22web.org/star_trek_discovery_season_4_episode_guide.pdfIn PDF document text
    • http://jekigun.22web.org/67986955890.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/r7bjchf/download_game_ice_age_village_hack_java_240x320.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/evangelismo_dinamico_luisa_walker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cdbb12-c735-447b-8aa8-beeeb082b1d0/7698255438.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/warezawijenepasufo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/cds_1_2020_notification_upsc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8244714-df48-46ec-a15d-265d90c9cb7d/zajibugakedasifepebas.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/zidoxinezat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f73e199-d55f-4f1b-aa89-6d1a043ba566/how_to_replace_battery_in_cyberpower_1500avr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdfe240-09e0-40d3-b968-637ef73a4a5c/what_kind_of_oil_does_a_2006_chrysler_town_and_country_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5f5192-66cf-4590-8948-4fd0d2455ca7/how_much_bigger_than_the_sun_is_betelgeuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efde8f8d-12e0-424d-9adb-8426e1b799f0/fifty_shades_of_grey_2015_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/jujonexim.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/battery_calibration_apk_xda.pdfIn PDF document text
    • http://magikid.epizy.com/17793864995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0d7152-06b1-4371-ad86-cba8b06197f0/particle_physics_lab_machinery.pdfIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/solosefixoxek.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 6056 bytes
SHA-256: 5c83af2c02bfb71ace333b77832d69d79d139c0f19e4a8a90bc9d8b3798e7d62
font_01_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 6600 bytes
SHA-256: 69ef156bf5e94b7106f84927f627339f90f0e7dff59f55957ac658c97cc82dfb
font_02_sfnt_off00013883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 11596 bytes
SHA-256: bfbd84efa4d2c548457c8815d242106dae88569e1359b4a6ffb3a3f886a120b9