Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bc8d3e1d46c0ba…

MALICIOUS

PDF

69.0 KB Created: 2021-03-30 10:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c4eee030acf9d9e35ca9e2bc7ca93afa SHA-1: 8c387b83486e9bec740774151bcdd516e3f13025 SHA-256: f7bc8d3e1d46c0ba67d9deb749e3bc8b14537132a94f1644b3eb2a120f2acf93
126 Risk Score

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 0.9993

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://xajibur.ru/123?utm_term=dominoes+game+apkpure PDF link annotation
    • https://cdn.sqhk.co/xamitarerivu/Qfzhjjj/easy_wallet_app_ios_12.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/81770625813.pdfIn PDF document text
    • http://smm-target.ru/kazuregelovitepajiwif5fab.pdfIn PDF document text
    • http://zozilejumulis.22web.org/magugep.pdfIn PDF document text
    • http://rkconstructionsucks.com/loborasewagezegorunaxuluvgzshu.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ji8jfia/galabuzazalegiremigawu.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/wurixepopavu.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/19167897877.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/bhjxieD/entrepreneur_quotes_motivation.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/13840966270.pdfIn PDF document text
    • http://gramnews.xyz/dagiramarududuroruf0nsmi.pdfIn PDF document text
    • http://insurancesouk.com/first_alert_zcombo_interconnectp2hby.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/gugebaxugirug.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ijLhf60/consultar_mi_saldo_at_t.pdfIn PDF document text
    • http://ketorebagibof.22web.org/52907256082.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/g0Ole8h/newest_hypercars_2020.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/48680036391.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/mathematical_reasoning_for_jee_mains.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/29790938869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valamujunitun.epizy.com/pdf_converter_compress.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/1346385425.pdfIn PDF document text
    • http://memanor.epizy.com/wifedomidelufajokev.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/58556986317.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 5168 bytes
SHA-256: 79d67433c01020e48dca314285fdeff10b1848eeb6910fc1b0ea47b10c3ecc70
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 11064 bytes
SHA-256: 37739f614f598d4c00ddae05bcc481fe94b01dbb43efb221f3902ee4942c4652

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