Malicious PDF — malware analysis report

Static analysis result for SHA-256 403090ada053a10c…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 07:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41e659fd72271392dd769c9a075124c3 SHA-1: bb6d37952eb3818f25a59d5270871f0561d79b2e SHA-256: 403090ada053a10ce73e44759c4793f232c0d01bbc7d05c35e68bad230bd2c6f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains text related to bypassing login and SQL injection, which is a common lure for phishing or malware delivery. No scripts were extracted, but the overall structure and heuristics point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://zajinet.ru/123?utm_term=bypass+login+sql+injection+cheat+sheet PDF link annotation
    • https://cdn.sqhk.co/dutudovajud/5gigjae/xofunodofezorokibisapuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_6008f4466d2f5.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/the_gift_of_the_magi_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sewitakin/hfii16G/wakorezinevudufakik.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/patofisiologi_filariasis.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/fwiKqFa/how_to_fill_rubik_s_cube.pdfIn PDF document text
    • https://cdn.sqhk.co/dagidomu/hjbxjcK/android_developer_options_demo_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/idVgjgi/movies_nearby_open_today.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ajcrrhf/mystic_messenger_zen_route_day_5_chat_times.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/ecHNMM4/idle_island_city_building_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_6013400d6dd12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467915/normal_5fc7ea3a57e75.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/xjdjaif/16172585734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_600ddb5645a30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_1b42a838a67740e38112df15138581bd.pdf?index=trueIn PDF document text
    • http://mujasanowagug.epizy.com/nejufel.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_104adda8ba3c4abcad2b5c8f74f4ff90.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_96d020a5fc6d4d7ca483e17130e14592.pdf?index=trueIn PDF document text
    • http://novogizeboje.myartsonline.com/why_is_the_dryer_not_drying.pdfIn PDF document text
    • http://tosurok.myartsonline.com/anestesia_raquidea_tecnica.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_495cc8a45b0c40d9b6f1c8f2e04b42ab.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_4d3d904ec17048d8bfcc2673734ab351.pdf?index=trueIn PDF document text
    • http://wojibejo.epizy.com/industrial_pipe_insulation_contractors_near_me.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/mathematical_modelling_and_analysis.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_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 5452 bytes
SHA-256: 51ee007e31fa6466b0cb2deabd4b91443a7077fdb07b00cc2ea604021c80f96c
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 12696 bytes
SHA-256: a4eb76b77b5ddc9e74d20900f03e9660321d0a83f8d936c0c4982a62013d04af

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