Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40773aabb703da4…

MALICIOUS

PDF

71.3 KB Created: 2021-03-31 00:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f90324f9cd4e9c2879ad0dccaf7269a8 SHA-1: 00bd7dcd6491e37d20f9b41a62a2c36250ac960f SHA-256: b40773aabb703da4bfebedc09e5a399232d1557a8e401ee93e2cd90ee7d16a40
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://baarspo.ru/award?keyword=schematic+eye+pdf PDF link annotation
    • http://frankiearvelo.com/peace_like_a_river_summaryg6nvj.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/fafegatoko/tughOhe/jezufisu.pdfIn PDF document text
    • http://idealsit.fun/why_is_my_toshiba_tv_volume_not_workingpoke1.pdfIn PDF document text
    • http://qrettalq.online/pride_and_prejudice_book_cover_original08726.pdfIn PDF document text
    • http://obuv-kozha.ru/62791099070u0quo.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/fiaqCJS/74967177587.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/betijefudozovekaqhukw.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/amazon_fire_tv_mirroring_iphone_freen4qjp.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/gcSdjb8/coda_meaning_in_english.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/sagotomagin/53299387475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c486cb13-0605-4a3c-9fa9-7291d52bead6/rain_bird_esp-rzx_wifi_instrukcja.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/pidotibitokaduroruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616a7883-9760-4e84-9468-68d859f515db/vivamowalunizirupanoj.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/dihybrid_cross_guinea_pig_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621b3a65-2228-455b-b10f-18b68132bd4a/nefixoloseneji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ab8790-8c1b-469a-8f3c-c63c3e98b642/mossberg_500_ag_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992e15bc-3b95-4b88-bed4-10170567a454/how_to_reset_timer_on_pentair_pool_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691bbdab-2aee-407d-b9be-87f2321c030c/78182209279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99860d24-ddc5-4f0c-830f-82efdab5d149/how_to_buy_bitcoin_on_cash_app_2021.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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 5296 bytes
SHA-256: ff15eeb4d60a4fda9ae7e025aaad207476ffdce089300f608052c9e2e31df4df
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10628 bytes
SHA-256: e0779356eeca338a39c2c3cd9d1727fefe8f656a4fac459998ed56eebc205480

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