Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c56ad837e85161…

MALICIOUS

PDF

71.6 KB Created: 2021-03-23 21:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8c58206790c6e71442e47bd84c8b7cde SHA-1: e84d59934f9ead6718dae9615fdb6a47455e60ee SHA-256: 82c56ad837e8516133585223585c24512098757dd745a1dd3da467dccbe5197a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=multiplication+and+division+of+rational+expressions+worksheet PDF link annotation
    • https://cdn.sqhk.co/putuziboki/gpIr3qc/nike_outlet_orlando_lake_buena_vista.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/s33pijX/64027281822.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezima/baia6he/spacex_starhopper_launch_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hdgcIdc/xekudameduxerakibeg.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/gdNb2QS/pisebabajebebufaridimexez.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/S1qgepY/vidawuzudowuvamexakelivo.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/a3bde5386.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/puzama.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/AjiEgjg/tuwutob.pdfIn PDF document text
    • https://givenuwijuzi.weebly.com/uploads/1/3/4/4/134445792/904da.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/iigIbP6/nike_outlet_vacaville_factory_stores.pdfIn PDF document text
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/9148094.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/angus_thongs_and_perfect_snogging_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nakevoja/glacier_bay_kitchen_faucet_manual.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/64598363736.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/piya_basanti_re_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/using_dryer_sheets_for_bed_bugs.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/dimitomoxaginolavifekanun.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/wonaw.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 5532 bytes
SHA-256: affc7ac592c15ecf3b48280fd6143c19051ad53113020f189ec16a72c46aeba4
font_01_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 11172 bytes
SHA-256: 5639fe37aec6dc7f2cefe690d19254247d4a99a3dc2a3bffc42c4826f1f7414f

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