Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac3522ab8847e5d…

MALICIOUS

PDF

114.7 KB Created: 2021-04-03 04:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a4a292f812a5c53afd91d9aadd2f1932 SHA-1: c163a353634da1a6c6bd7ec6f3e366d77bee2d81 SHA-256: aac3522ab8847e5ddc3b583b7ee22b63c27b13215e93758b5214e5100dff7925
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://xezojetit.ru/award?keyword=the+symbolic+interactionist+theory+in+education+pdf PDF link annotation
    • http://lowwsaw.xyz/power_of_thoughts_swami_vivekananda3nzaq.pdfIn PDF document text
    • http://xetorobexojukas.22web.org/citizen_watch_wr100_price.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/mabadaxodawus-wobitugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_600e8445a2a58.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/30421536723.pdfIn PDF document text
    • http://alerma.ru/free_printable_emergency_contact_form_for_babysitter3gfks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fff7d056da8a.pdfIn PDF document text
    • https://lanilemu.weebly.com/uploads/1/3/1/3/131381326/254694.pdfIn PDF document text
    • http://sdl-trade.com/run_for_the_cure_charlottetowncejos.pdfIn PDF document text
    • http://lujedovijoluje.22web.org/apache_poi_word_to_example.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/kujer-zutifidofupome-muferiwojikaf-gofalanus.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/penisujiku.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/caf1ad8b1a42ffb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watimesuw.rf.gd/91857157743.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/libro_de_fisica_3_secundaria.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/tojuzepasupawame.pdfIn PDF document text
    • http://jijuzawipuvabuk.rf.gd/abb_medium_voltage_transformer.pdfIn PDF document text
    • http://nafabumawo.rf.gd/78581246430.pdfIn PDF document text
    • http://vonibuvet.rf.gd/antibiotics_medicinal_chemistry.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E21 5588 bytes
SHA-256: 5f6788fc82da78cf54454fd5b43e57cdeaf73934ff6c5b585a93468ff908ba19
font_01_sfnt_off000180f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F5 11560 bytes
SHA-256: 390b5f2746f2c51e9f64b12420eed68604488fb568c76ce77bd9bdcfff5b4c27
font_02_sfnt_off0001a7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B9 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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