Malicious PDF — malware analysis report

Static analysis result for SHA-256 73062dc8fb5840b0…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 13:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 907daacacb95f13808e8a75d2ea10e3f SHA-1: 9d1c5e7a1b762368d465cd04ad11537353f96689 SHA-256: 73062dc8fb5840b0263fd1d1c6f1e693d96b183088b1e7499fc80e3041142f18
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pelibifir.ru/award?keyword=email+extractor+from+pdf PDF link annotation
    • http://secret-empire.ru/what_do_san_juan_mean_in_spanisho16c9.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/52679565570yt7sb.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/cRhamif/17945132374.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/the_blade_itself_incites_to_deeds_of_violence.pdfIn PDF document text
    • http://erogan-encolumbia.site/balalaika_song_freeg0x8r.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/hp_officejet_4500_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/gcRihJX/wejojoxogupuwid.pdfIn PDF document text
    • http://alteramaks.world/amazing_color_fill_3d_how_many_levelsci7uu.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/8iihbge/wibizazunuk.pdfIn PDF document text
    • http://copyright-security-ig.com/amish_tripathi_sita_warrior_of_mithila_free_download3h6cm.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/xeponodij/midakipagekegowoner.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_fa10d6337c764c41851cb814e5362e99.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_32e67f89d48a42a68fd6cce91be15a15.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_f44695d577534fea807cfe34a26064eb.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_d799a149d81a439ab033dfc31285b89a.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_a241b9b1f3d74840b0986bf3732bb7b6.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_b926af776f774f4898ff4fce72650722.pdf?index=trueIn PDF document text
    • http://tosurok.myartsonline.com/software_architecture_download.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/kowivotetokiruwoku.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_7a6887bf6398465b9808137df3a9f793.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/dajenumevuludekovap.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_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 5148 bytes
SHA-256: 24bb66d98a6699e31c13cef68a047ffa9e3e2036b47c9c0293c6e06d277ac844
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 11036 bytes
SHA-256: a298ee50af4ec266453241ef9b57caf5b3079206bdaa70e736b49d073d77114e