Malicious PDF — malware analysis report

Static analysis result for SHA-256 705d41ed38db5c52…

MALICIOUS

PDF

98.0 KB Created: 2021-03-18 10:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 3d8028853c4e9b426525a9958416f0c0 SHA-1: 5ffc7612808a337ce4c91e06652ebeec3a544a70 SHA-256: 705d41ed38db5c524749c5974d27023db0cc079ab8238f946c5bc71b9b5930f3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with several pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to distribute links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fokemale.ru/123?utm_term=dvdvideosoft+3gp+video+converter+free PDF link annotation
    • http://baykamif.space/avid_pro_tools_12_free_windowsokbcb.pdfIn PDF document text
    • http://flash-sar.online/veradow7x5m.pdfIn PDF document text
    • http://erogancolumbia.site/xeputapivpjaov.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/2iajhyB/zazotedisutufifupelunit.pdfIn PDF document text
    • http://tigusomoxuwij.22web.org/jakupuboguj.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ngi1O4C/25232521588.pdfIn PDF document text
    • http://secureappeal.com/pepokanufabofiretudha1ay.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/5Lib1rF/electrical_calculator_cost.pdfIn PDF document text
    • http://goodsun.fun/relativism_philosophy_of_science_definitionsxl7l.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/masewapataga.pdfIn PDF document text
    • http://penakubixivali.22web.org/tuwabegadukutiloxidej.pdfIn PDF document text
    • http://sadovik.me/aaron_jones_packers_injuryjo2ru.pdfIn PDF document text
    • http://clientesdkb.com/articulacion_del_codo_anatomiasrxo7.pdfIn PDF document text
    • http://bitcoins-profits.com/brain_rules_for_baby_by_john_medina_full_book_download3yguc.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/cBhkKhi/frogger_retro_level.pdfIn PDF document text
    • https://cdn.sqhk.co/gunumiku/aGVHVsp/newcastle_rugby_league_2020_grand_final.pdfIn PDF document text
    • http://instapodarok.site/wakeditadolafush04v2.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/webasto_heater_service_uk.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bbe2c3-b6e7-42d9-b6b9-ad3910db83e7/xerox_workcentre_3325_system_administrator_guide.pdfIn PDF document text
    • http://wuxojawe.epizy.com/the_americans_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e5f1f2-683a-4dd2-a094-aa98c971e9df/sowimaraxika.pdfIn PDF document text
    • http://wovovaj.rf.gd/bharatanatyam_telugu_audio_songs.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/95368359343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce163e6-382f-4742-bffb-d8051798ee7b/best_self_help_books_on_amazon.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010028.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10028 15764 bytes
SHA-256: 3e3342904c4439bf84e055cb37a62a2b16c570ed38a6c4d1eb7745951e3b5c3a
stream_006_off0001508d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1508D 23656 bytes
SHA-256: 721339ba259a7aa44b8fe56d5a2e38f833644f160593aab018bc3bb7e41199ec
font_00_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5304 bytes
SHA-256: b13a2097da0c1f6842c4980a3a99b4df602d13e414fa5a74fb0e5e1e940e7956
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 10868 bytes
SHA-256: 317faf9874298b99a015789a76e1decaa9882d4d3867574b314e5e160b6e1bf9