Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa66e8edb7628e04…

MALICIOUS

PDF

70.1 KB Created: 2021-03-31 03:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b812813bb9f39f971ff7a27a15d89d90 SHA-1: 8e6683a93a5c3047c520512650afb5c3c3c54d82 SHA-256: aa66e8edb7628e04fe647625df505ccf1277a4072b45da25fc8a988c328558ce
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 ClamAV and 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

  • 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://jumiwimov.ru/strik?utm_term=rinnai+panel+heater+instructions PDF link annotation
    • https://cdn.sqhk.co/remimidotomi/hiGidxd/vikings_game_live_stream_youtube.pdfIn PDF document text
    • http://artelamp.store/busqueda_de_informacion_en_internetd1xi7.pdfIn PDF document text
    • http://idealicacolumbia.site/dobewenuzipinxeew8.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/tigekapoforiwi-goxaniwokofexi.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jcjfQdf/15190939545.pdfIn PDF document text
    • http://copyrightnotices-form.com/how_tall_is_draco_malfoy_in_half_blood_princeofuab.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/Oifgfih/subterfuge_def_francais.pdfIn PDF document text
    • https://xovewelokajefi.weebly.com/uploads/1/3/4/8/134864882/8910705.pdfIn PDF document text
    • https://tilijaxak.weebly.com/uploads/1/3/1/3/131381787/7910262.pdfIn PDF document text
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/23a68.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/dxhaFhj/my_dolphin_show_6_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/kitobanifamo/ehdengN/vogevokonapuzeguleg.pdfIn PDF document text
    • http://afracheat1.xyz/strength_training_exercises_weights32fea.pdfIn PDF document text
    • http://mailedflkf.site/3348496749fml8u.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/734dc134-6168-4dda-bceb-267c8fb20984/tables_of_normalized_associated_legendre_polynomials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9318ed-b15d-4a25-99af-1607fe0f229d/so_sew_easy_skirt_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/isabel_allende_la_ciudad_de_las_bestias_resea.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/guitar_family_chords_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4e4fb8-a80e-490d-a9f8-d7e5ff5c7dfc/how_to_adjust_the_carburetor_on_a_stihl_bg55_blower.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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 5028 bytes
SHA-256: 327a09131f4881ec9a2505bf6f99be84dc22c6e4d456a6678e8a85a1d6253066
font_01_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 10732 bytes
SHA-256: 8600f86802e873e18fcadf969370a3b8d4147190da42a3c98a104a23f66ff1e7

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