Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc41b7e50ab77d4…

MALICIOUS

PDF

84.3 KB Created: 2021-04-23 23:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d09829afd475ec33ce307fda2f009b32 SHA-1: 5f79b66934d222d0556590395b5dc117ac715529 SHA-256: ebc41b7e50ab77d4441baa22931f9349529ac3ce56ffaf8cd7da3d958078e607
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to redirect users to potentially harmful content or phishing sites.

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://nipisod.ru/strik?utm_term=what+is+ed+from+fox+news+doing+now PDF link annotation
    • http://mufutekuson.getenjoyment.net/4798891188.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/can_birds_eat_papaya.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/bamavosi.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/27502541653.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/deteminovekabez.pdfIn PDF document text
    • https://bakefakibozig.weebly.com/uploads/1/3/4/6/134678469/sipok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_6001a9c2eb193.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/9855963.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/hansel_and_gretel_2020_review_indonesia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6041eecdd138b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_5fd198abd1222.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/sri_narasimha_kavacham_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5ffaa2db42a1f.pdfIn PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/2855634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_0e770aeed2634bd6a29264899ffea6cf.pdf?index=trueIn PDF document text
    • http://zugepoguj.onlinewebshop.net/class_6_mathematics_book_download.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_38f9e6404cb64f288fdd855a57f3cb94.pdf?index=trueIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_21eeb4c888474ac0ae24c5986ff8fe56.pdf?index=trueIn PDF document text
    • http://nejarisiwudu.atwebpages.com/ray_bradbury_i_sing_the_body_electric.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 6424 bytes
SHA-256: 120dfd7c7977cfb9a90e0c19aa24ce80f3ad63f69756627d616fe21accc03e95
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 5464 bytes
SHA-256: 95e8f3167821228c477641efdf407ebe811022bcc0ff9c6984f0ee4bf858c178
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 11604 bytes
SHA-256: 1609ba62d50918a762aef3b3ce5146a049edf2e54c0094f54b6eba155cd2725e

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