Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f291a2c9c71e1b…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 03:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f45d7d18df20e5b01d9053f451f907f6 SHA-1: 9a55a2108757c3284943162ccd65668d929f10c6 SHA-256: 89f291a2c9c71e1b28a9eaf5f2ebe64e80c832fff38c1cce9eb0fd202813bf47
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or facilitate phishing. The primary malicious URL identified is https://seumenha.ru/strik, which is likely used to redirect users to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=customer+service+associate+job+description+resume PDF link annotation
    • http://tinipen.medianewsonline.com/jurnal_multimeter_analog.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/what_is_sap_hana_enterprise_cloud.pdfIn PDF document text
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/8673609.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/1a3ab3d765763.pdfIn PDF document text
    • https://taregegojife.weebly.com/uploads/1/3/3/9/133997559/da1c3f312cdd2.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/73e2075.pdfIn PDF document text
    • http://xazapefunel.getenjoyment.net/hey_soul_sister_uke.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/1924c65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_619f7c20fa114594bde4215164c37ab7.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/sabitegatajarojex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6febdd16-f7c5-446d-8ecf-3dbd309969f6/78624528118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac0a863-9e2b-45e6-a221-3ef83c8737a8/how_to_properly_rig_a_fishing_pole_for_trout.pdfIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_12e805c6e6e84105bb2da5ad6e90f7df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6e2932-6eb4-4594-bcc1-b5395bca59da/how_to_write_pseudocode_in_latex.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_dcf015a201444588936e9f101dc2631a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d059edf6-7830-4b7c-a21a-94b12f2bcbbb/midoru.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_8a7c7f79cb3943bcbd5a899719cb9737.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f455dcd-a5d3-4d06-a600-6c3ba1a8dddb/primeros_establecimientos_de_alimentos_y_bebidas_en_nicaragua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e56dcc8-d005-4550-95df-23b750c43019/faxixeja.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_1940bdd6fbb74f16a411c191056105f2.pdf?index=trueIn 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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5368 bytes
SHA-256: 1fecbc8aa9c53688658f7e6546134db4459c17dedfa0ab01168f822ec18d45b2
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10192 bytes
SHA-256: 6f7e044a7a06f9e4db2c53c5d34a2d76eb30d89b5512ebb1f5f3e88ea2c5ddce