Malicious PDF — malware analysis report

Static analysis result for SHA-256 804312e1d46b3bae…

MALICIOUS

PDF

79.3 KB Created: 2021-05-22 13:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 21b50d7d27a0a3a6402dcbd6247c4709 SHA-1: e2d8d63e248728aa950f4de5f1d7f7cfb3b252dc SHA-256: 804312e1d46b3bae33f5603f6e053032ff86d32a870e6bd02c6422b65690ac35
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV both flagged this as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs, such as https://baarspo.ru/strik?utm_term=how+to+do+step+4+alanon, are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=how+to+do+step+4+alanon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481828/normal_6048a9ac26a9b.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/7970410.pdfIn PDF document text
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/2adf2041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_601d890241c8d.pdfIn PDF document text
    • https://megopupe.weebly.com/uploads/1/3/1/1/131163834/xisimux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_6007059bb3712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_605aafb5d0ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_605f7b45e64c6.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/0bc1dd8e71d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_6001a0d675f4d.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/d7917c089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5ff4cdd77a99f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_606d22f61ec1f.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/538898.pdfIn PDF document text
    • https://dasomuduse.weebly.com/uploads/1/3/6/0/136095852/d50fb40ebeadddc.pdfIn PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/maxugaji.pdfIn PDF document text
    • https://vidowenabep.weebly.com/uploads/1/3/5/3/135322196/zatovaxaxon_pinenol_nalojarupefelu.pdfIn PDF document text
    • https://xapetivaxi.weebly.com/uploads/1/3/5/3/135347241/3256df01ca99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_6026bbf3f1611.pdfIn PDF document text
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/c07322bf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_5fd7877cd01ef.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/9dd29c0c-e39d-4ee5-b928-e45f33b1484f/8330799883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/600fca22-c49c-4c8e-ac94-a850b458b947/metal_gear_solid_v_the_phantom_pain_quiet_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e90ea9-a8ce-4aa7-bef8-4d9223aa9d8c/96633089537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93719172-5983-4e25-9eef-46911e805203/kudatasad.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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 4996 bytes
SHA-256: b747379f0125cf321a21e46781c9faa6c220adb80d29ac6e0d04478c0960109a
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 11072 bytes
SHA-256: cc1ea1823f4e08e9f4484d35539b37ba049f1f385c127d36fbd2614a2bb7867b