Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86b15e589564e9d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 00:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8f710008ce0d5dba4a464ba587b1aa5a SHA-1: 5451419cc7704ce98a5c4874c3aa0b723c5ba8f3 SHA-256: f86b15e589564e9d3f24f3556910e12eb561b812ba87c04ead85326b43935cac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external URIs suggests an attempt to redirect users to potentially harmful websites, possibly for further exploitation or phishing.

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://nipisod.ru/award?keyword=anti+static+flooring+specification+pdf PDF link annotation
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/petej-jijoforozawi-nomix-raxatebalosimul.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/77637807237.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/18256942609.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/60cb53192d0df35.pdfIn PDF document text
    • https://fovibera.weebly.com/uploads/1/3/5/3/135324383/70ea6663.pdfIn PDF document text
    • https://seserasug.weebly.com/uploads/1/3/4/6/134678868/gugibupujip-musux-ridewuge.pdfIn PDF document text
    • https://furizakifoji.weebly.com/uploads/1/3/4/4/134446406/4214096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2492064-8e23-47c4-9f8a-237d3ccd6f97/melit.pdfIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_5844ce6ff9204ae1b4c938d379b587b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3034f7fb-cf33-43ba-a234-28e9c339459a/6393391669.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_05069653d2ce4be5983548be8894ab71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a75cbc0-b7ae-4913-879a-d2b525950663/nobunisutamijijurol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac4b9ff-8d58-4867-a1aa-0713da9bf1a2/oster_coffee_maker_clean_button.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_b450dcb042a14c22af47ab9ac7303e71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4c9047-55c4-49fa-9a1f-5638558661bf/76363658677.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_d0dd233b8b2c49c59b8416ac45bfc8f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbb9f13-db14-4eb1-aa10-608ad0eb5110/6182181841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e84f94-c16c-437e-8396-311dddcf0bfa/next_dd_5e_book_2021.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_4251ba8862e24794b33e3a4e3a2bb284.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_8818692f7f2d4ebaaf1a0fffd6f8fbec.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_a96901fde3a7494c9b4f4815ab4010aa.pdf?index=trueIn PDF document text
    • http://gufopexolax.myartsonline.com/56694429015.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5312 bytes
SHA-256: 45e0eb32b61a4f1602c0a88134d3800fe20f6478db4ce02dd3557b8b74787041
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 11320 bytes
SHA-256: 5350391593a69873548b67dabef06f008eaac676aa201e34b7faca67e4694b0f