Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3741ab604fd8b5…

MALICIOUS

PDF

76.6 KB Created: 2021-03-06 00:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd5d2f1e4df0ecbcd00f32731b5dc9c9 SHA-1: ba8a918461069465dea9a5e76b6e96929f6bb56f SHA-256: 0b3741ab604fd8b5aa8205d99c8eac8f376943147094c1f77a89c488f69cad08
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 redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious redirection scheme.

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
  • 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://dafemum.ru/wb?keyword=phone%20games%20to%20play%20with%20friends%20online%20free In PDF document text
    • https://cdn.sqhk.co/foroboreb/fwhfhyu/43380284006.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/lopexonajifakepapopune.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/PhegiWS/toy_soldiers_cold_war_xbox_360_cheats.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/firosoduzibajazometon.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/mGyhjig/koxugudedafafafoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/AJgfNie/offline_videos_for_babies.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/gfldh6s/28697251052.pdfIn PDF document text
    • https://cdn.sqhk.co/merisipugito/d0pjbrt/laruliwapagitepos.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/42631880419.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazolefozu/d4LjSij/talking_tom_gold_run_mod_apk_revdl.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/5808104.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/jiBZkgh/12708576357.pdfIn PDF document text
    • https://sipizoreju.weebly.com/uploads/1/3/4/1/134131451/e31a1fc.pdfIn PDF document text
    • https://cdn.sqhk.co/larovejadeb/gg2ihrw/27478494869.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/free_1st_grade_printable_math_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/hhLidgf/13381910986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokesakogo.onlinewebshop.net/my_passport_ultra_how_to_use.pdfIn PDF document text
    • http://niwuzij.rf.gd/daily_stock_inventory_excel_template.pdfIn PDF document text
    • http://javajese.epizy.com/microsoft_azure_iot_edge_platform.pdfIn PDF document text
    • http://zabirozoxut.epizy.com/mibabakifewoki.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_a9f0d362afb645d1bec8589ac199b615.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_cc3dbad98ef645c3b2a62fd658d7b88a.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1a35037ea1724eb2bb72ef8951a9215e.pdf?index=trueIn 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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5652 bytes
SHA-256: 29252b27e00d2e1c7958a64d4c33ecf1a2af35584de1a6f736fd0648716d07c1
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 10212 bytes
SHA-256: 47afba54ae115f894ef0d20eaa4815f35232668d3b7972d04779f38d4e34b8ce