Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a33b1efcf5655b…

MALICIOUS

PDF

58.3 KB Created: 2020-10-15 01:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1b319866d31a67805001220316535076 SHA-1: 24455bef213c0c05c4e640242fbce8acbe6d4c95 SHA-256: 73a33b1efcf5655b59f6d4c600e26fb2a1f87704c27a3f1ee1e6296e7ba194a3
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/strik?keyword=le+soutien+scolaire+pdf In PDF document text
    • https://site-1038468.mozfiles.com/files/1038468/rizagow.pdfIn PDF document text
    • https://site-1039838.mozfiles.com/files/1039838/nujomubiguveleja.pdfIn PDF document text
    • https://site-1038326.mozfiles.com/files/1038326/wuloxofarisajelejowod.pdfIn PDF document text
    • https://site-1043158.mozfiles.com/files/1043158/bozesovel.pdfIn PDF document text
    • https://site-1037833.mozfiles.com/files/1037833/47033492302.pdfIn PDF document text
    • https://site-1040209.mozfiles.com/files/1040209/gupat.pdfIn PDF document text
    • https://site-1040339.mozfiles.com/files/1040339/59745001388.pdfIn PDF document text
    • https://site-1041501.mozfiles.com/files/1041501/lexegikofipi.pdfIn PDF document text
    • https://site-1043199.mozfiles.com/files/1043199/xakowom.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/438e071b43ca.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4056517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0e445b43-0501-4dec-8ce9-56fd94a2d69d/demetixupimomoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3448084a-c17a-4dad-b831-84d485362eb3/fituzilojeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577aab3c-514c-4080-bac5-bd4e9e5a75a0/91304855678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d82c64-022f-4653-8e6f-9a67f7aff71d/49967045154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef8203a-8643-4ed5-9fdf-aed2d1daa35c/78724398502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c988519f-9cf4-45a3-9ac0-fab980c52203/vozulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195071b2-a4c4-4f39-b23e-5ca07c527799/18920036388.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8481/7583/files/72287271383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6978/7300/files/mobile_phone_tracking_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000915b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915B 4972 bytes
SHA-256: bcc86b23a053e5511784accc89424ee2de1ad11b5ef0a900dd085870a9c74099
font_01_sfnt_off0000a24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA24E 14012 bytes
SHA-256: 998caaf76a9705f874280444b1cb8fb0b67ad902a911e5dc541438be4741e089
font_02_sfnt_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2