Malicious PDF — malware analysis report

Static analysis result for SHA-256 5674baf6b5cbdff0…

MALICIOUS

PDF

76.6 KB Created: 2021-05-31 13:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6fa2b26f90e806a41f7f29f2ad418741 SHA-1: 26a56465b71cff8c17d73e5354ec582f1ecc7486 SHA-256: 5674baf6b5cbdff09918f7d01d272949f5e301c138bc2eb45b7cce301a52f52a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as a phishing trojan. It functions as a link farm, containing numerous external URLs, with one prominent URL being `https://seumenha.ru/strik?utm_term=kiwi+benefits+in+pregnancy+in+hindi`. The document body is heavily obfuscated and appears to be malformed, suggesting it's not intended for direct user consumption but rather to host malicious links.

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=kiwi+benefits+in+pregnancy+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458840/normal_602ab9dde8294.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/9683809.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/gajuxivudof.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/2b856681.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/fomomovajifir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_6050e79066c4b.pdfIn PDF document text
    • https://dumamawikop.weebly.com/uploads/1/3/0/7/130740251/zafuri.pdfIn PDF document text
    • https://foluxafan.weebly.com/uploads/1/3/5/3/135397430/274197.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/335c251cdb2128.pdfIn PDF document text
    • https://nomumiti.weebly.com/uploads/1/3/4/3/134330837/8508661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fee9b1960396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_60512b0452375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6008954dc3091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_5fe6339b1b357.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/3c542deb-1f84-4981-89ec-c72a341ac94c/92453352139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1887726-21b2-4115-8cf0-5676416009cb/yashica_mat_124g_120_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e646d80-6638-48ee-9139-131183633ec4/how_to_fix_lg_sound_bar_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5c526e-29e3-4d10-9dd7-ba3e78806e94/what_do_the_letters_mean_in_the_16_personality_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee68b84-578d-4309-9b55-a45a023da41c/vamuverusipatuxedubujas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40227f73-59c3-4cda-9c4b-00aebf010c22/program_philips_universal_remote_for_vizio.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5688 bytes
SHA-256: 0c0a975fb5b4b5015dec0a997939aaf6567f9b1aa82b0a561ce1358e6774b44d
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10532 bytes
SHA-256: 633b09d2a7ba9cb25003a8213ac29392b1b885fe531c46e4c4a8359d400cec1e