Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae6a6eb202ff41e…

MALICIOUS

PDF

72.7 KB Created: 2021-02-25 01:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d994a741ba017129dce72de16fc362e9 SHA-1: 00625902c9a56d9c965446ac1e418fbc53d6d95d SHA-256: cae6a6eb202ff41ee64fb34c7edc1f3f00d48cadf98e8fac7bbb6e1c90538063
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=cuisinart+ice+cream+maker+ice-20c PDF link annotation
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/18b751.pdfIn PDF document text
    • https://letobepep.weebly.com/uploads/1/3/0/7/130740206/4d4f7fc940bcd51.pdfIn PDF document text
    • http://hr-insider.com/how_to_import_music_files_to_garagebandhq7jm.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/7543457.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/vagaxu.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/duvuworiwel_rawebifap.pdfIn PDF document text
    • http://lolabarafusiru.iblogger.org/crystal_reports_designer_64_bit.pdfIn PDF document text
    • http://catsism.com/komatsu_15_forklift_service_manualkngbf.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/5c57d2.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/e55178f85ec0296.pdfIn PDF document text
    • https://papokekes.weebly.com/uploads/1/3/4/5/134599002/bojafajawozemoj_ponukugowivux_kabidirir.pdfIn PDF document text
    • http://sputnews.com/hare_rama_hare_krishna_movie_songs_free_download81rcq.pdfIn PDF document text
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/xunuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5188 bytes
SHA-256: b6efbc76a897181f97a01f6fddbc1fd13dbc415c5d2fddc67dc4932c58dcc67e
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10352 bytes
SHA-256: 96cb5dcc498f829707b98d7f4e281ba58004733877700fdaec02dc53cc9ed3c5

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