Malicious PDF — malware analysis report

Static analysis result for SHA-256 385a95a10e020fcd…

MALICIOUS

PDF

98.7 KB Created: 2021-03-25 08:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ceef600193a27a299df982ba84a27cba SHA-1: 5bc9d9c92398ae5cc440d476294592e2d55a58ae SHA-256: 385a95a10e020fcd5f2d57ddbb79d31b1e7cb33b66761dcc2fb5aa0ab6a53564
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to direct users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=basic+ethical+principles+pdf In PDF document text
    • https://cdn.sqhk.co/zapiseniw/o2bjigd/4_pics_1_word_level_2291.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/butesisorusote.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hgiWhid/du_admission_deadline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370987/normal_5fe1607a1c081.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/hiajdAE/indicative_term_sheet_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/XViihfp/preppers_food_list_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_605a0220f1ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/Xjggd7K/pacify_farm_update_crack.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/polygons_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ffc1b018d8e6.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/menatupet.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/rinnai_infinity_24_installation_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494888/normal_5fddcee3e403a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_604e6b57008a0.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/9629253.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/iaVfUhd/xatezopozaxig.pdfIn PDF document text
    • https://sowuritujozefa.weebly.com/uploads/1/3/4/6/134621612/aed20942.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/Se0ggib/tanogidamelikajosuralenus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gituloropo.rf.gd/cement_and_concrete_research.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/o_caldeirao_azul.pdfIn PDF document text
    • http://karadefega.epizy.com/la_biblia_latinoamericana_edicion_pastoral.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/beach_buggy_racing_cheat_engine_apk.pdfIn PDF document text
    • http://vanuzavabew.epizy.com/aulas_basicas_de_ingles.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_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 5292 bytes
SHA-256: 10c6e3c51b187e87f5bfdcddb3873fc8d4df7129fce50be02babf4ebb1186efc
font_01_sfnt_off0001583d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583D 10900 bytes
SHA-256: 9bdea53881565b81cd4368422b089bd02c477ac499f272557f57f4c7bc98a8be