Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b97e8ca4b88b21…

MALICIOUS

PDF

70.0 KB Created: 2021-05-13 00:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13e5ddb82a5dcc0fa48e9794ff850f51 SHA-1: 93319562d1a20e03382767fe296b3ad8bba3d497 SHA-256: 81b97e8ca4b88b21d114207120acdc18935d2a762f708cb23abc6c18bf9e4b3b
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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://golowaki.ru/strik?utm_term=best+penny+stocks+under+10 PDF link annotation
    • https://cdn.sqhk.co/xapewiwud/aghpieg/gifavogeraruluvowexipidax.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/hahb9vN/lawutadawonidevovuv.pdfIn PDF document text
    • http://freds.space/zovabusekugiboh5ost.pdfIn PDF document text
    • http://airbin.top/popstar_never_stop_never_stopping_gay_songrkm6i.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/0eOifhg/dj_sound_effects_free_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/gcJibgh/29651157137.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/H4khh9Q/44144872792.pdfIn PDF document text
    • http://sreda.city/45075296807zm2yq.pdfIn PDF document text
    • http://hesap-al-sat.com/copy_of_orders_assignment_notification_or_equivalent8i04d.pdfIn 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/15f77871-af45-49b3-bbc9-a6094e810626/linksys_ea2700_custom_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa6c828-fa1f-4aa2-85ba-b288e9f6fa32/what_is_projection_in_psychology_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9ecc4e-987a-4f4d-8862-7dd6359b1100/new_york_new_york_brass_quintet_sheet_music.pdfIn PDF document text
    • http://wesamejoz.epizy.com/how_to_fix_a_jammed_button_on_xbox_360_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1149444-a140-402c-873f-8d02e2cf1b28/32904875123.pdfIn PDF document text
    • http://kufilabed.epizy.com/60086964246.pdfIn PDF document text
    • http://wusopirixalanop.rf.gd/maytag_2000_series_dryer_start_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485e70e1-86f3-4612-af46-847da663c740/offense_to_beat_1-3-1_zone_defense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec326916-4756-4a86-9c37-3c0057ebe44a/which_is_better_fitbit_3_or_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540d62f1-8679-4dc0-b518-c13e99759d4b/totixukufuferafoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd46084-a74c-4bbd-8dcf-a927545163e6/vox_tallahassee_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2420a3-174b-4c30-842f-d24f8f5b14f5/52525891116.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 5232 bytes
SHA-256: 6b1c98801c390f9d2337c441233b52a7a448afec6c52f4ffdc75857d262c338a
font_01_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 10540 bytes
SHA-256: 3a6927f5fd8e5b20cf5eb6e0e1207f2b725d84ad2d82f5d1dadfd9e1455b8374

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