Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c11cf1fd7e58ae0…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 18:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ea4ab79d216c2def37fcc351bc31aa5c SHA-1: 954d772614f6ea012016cb23f709f494b93d5196 SHA-256: 8c11cf1fd7e58ae02373f22219d22fa44822a6267b76a2d868492ac802504684
126 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a malicious intent to redirect users to potentially harmful content. The primary URL, 'https://lozipotod.ru/wix?keyword=pokemon+tournament+game+apk+free+download', indicates a lure for downloading game-related software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://lozipotod.ru/wix?keyword=pokemon+tournament+game+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450731/normal_603ed97173512.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/muresujab_suzujomefifiw_linevej_xepesavutatawul.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/7230294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_6008eb559111b.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/visepipixutizodog.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/6531214.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/schlage_keypad_lock_troubleshooting.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/17d1f76.pdfIn PDF document text
    • http://juzajikadig.22web.org/anti_terrorism_act_uganda.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/6813259.pdfIn PDF document text
    • https://lelojijesinawe.weebly.com/uploads/1/3/1/8/131871501/nupatebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_5fe3db0c538d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420592/normal_600213173e568.pdfIn PDF document text
    • https://firatilis.weebly.com/uploads/1/3/4/6/134689017/2561105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejonoma.epizy.com/zojezakuzudurelukiragod.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/poseboxonuviwatusaf.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/tewefefi.pdfIn PDF document text
    • http://tamazodatitemi.epizy.com/dance_practice_wanna_one_boomerang_planetlagu.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/least_common_multiple_definition.pdfIn PDF document text
    • http://zumepif.rf.gd/38287355907.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/how_much_do_deck_joist_cost.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/90621679904.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5340 bytes
SHA-256: 619b314ed20c3e59b13ff0b4d6ca54010818ee8d41bd465598d2f77ce554ba81
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 11512 bytes
SHA-256: c3ed8bb5f12c446d97d9189df27d891897d7241abc05273a72d4bd222daa9607