Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b97e9e18cc5ab1…

MALICIOUS

PDF

67.8 KB Created: 2021-03-12 09:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ab12cd4ca877c99433f04678b59fb48 SHA-1: 21095541214378caf1eeb05659ad866895a6b079 SHA-256: 30b97e9e18cc5ab1af652210cb575cd849f5b4acf539a864306b9bce9cd002bb
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the document is designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/123?utm_term=bollywood+video+songs+2017+free PDF link annotation
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/61aa6f142c028.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_do_you_unclog_a_hoover_windtunnel_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/DgjmFif/skin_among_us_for_minecraft_pe_download.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/suwifizonolavixi.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/j3LglG2/stupid_zombies_3_hack_download.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/744473.pdfIn PDF document text
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/9984055.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/tenul.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/f3b45d66cd0.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/eij5Rak/87472043132.pdfIn PDF document text
    • http://dokojekiferej.mygamesonline.org/web_application_architecture_book.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/70cd665aeca.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/water_pollution_solutions.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/coach_quotes_letterkenny.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/1M8ijdF/guitar_flash_2.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/munkres_topology_solutions_section_56.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/fululowetuxi_pejiw.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/givimiju.pdfIn PDF document text
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/77538e4681b6.pdfIn PDF document text
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/kotopexak-bixufebedol-xewona-jejiji.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/sudotipemazumugof.pdfIn PDF document text
    • https://nibawisid.weebly.com/uploads/1/3/1/0/131071209/578568660c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://geforagegi.atwebpages.com/five_channels_of_communication.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/pulp_fiction_bible_quote_samuel_l_jackson.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_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 5572 bytes
SHA-256: 7d081dde1c69cd418fb4a11ea0c571e8dc259618b508a00c5e3d50e15e27b851
font_01_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 10504 bytes
SHA-256: c9367c595ad90e70e19102476a9429584d3730a2d91b0fa19b0f4b0ae1bb6060