Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d318730dfbfe185…

MALICIOUS

PDF

83.6 KB Created: 2021-03-15 06:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3dd99b9971139961c7bbb098462e202 SHA-1: 8fd7e4bedd0b923bd59c155241d651621df3cb34 SHA-256: 9d318730dfbfe185cdeb30fb8e253b247a5963d93efc47905d661092bd353d43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=rita+mulcahy+pmp+exam+prep+9th+edition+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tajaketo/x9vjhjc/overdrive_ninja_shadow_revenge_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/fVqdZgh/led_ps4_controller_for_sale.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/4dcf9c0f2bad0.pdfIn PDF document text
    • http://xuxisozolawub.22web.org/lapejasufulaj.pdfIn PDF document text
    • https://fovenuratosoka.weebly.com/uploads/1/3/4/5/134582487/gazenekijukid.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/494879.pdfIn PDF document text
    • https://cdn.sqhk.co/terexugureto/bifuidS/puppy_dog_full_hd_wallpaper.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/242273.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/hdggjag/ultimate_wolf_simulator_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/fghdOhg/alcatraz_escape_room_game_toilet.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/5553403.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/wemupajese/19600856484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded9da75-cd94-40c1-81ec-59acf2087edb/bernina_830_record_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89697a56-fe6f-4a4a-a2b6-a6f6fc1b2948/69575165344.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_1cbb3b4b553943deb13ecbebc3af0895.pdf?index=trueIn PDF document text
    • http://xofunuxemijowex.rf.gd/11533459333.pdfIn PDF document text
    • http://xorewabamav.epizy.com/sam_cengage_project_answers_2016.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_ec6ab3d940174ca1b3f4cfb5eb309365.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_b98391dba8694a62928ab2110b6d041c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/after_effects_expression_transform_scale.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_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 5524 bytes
SHA-256: 56dde13f97835d41a925e5e40463f684d2aff49316401d3450409f5b510af300
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 11624 bytes
SHA-256: f3ab42c65d53a9a824e370dc8b4517e75a8b3ec3b179079928decebcaf3f045e
font_02_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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