Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b697bc95b31e803…

MALICIOUS

PDF

81.5 KB Created: 2021-05-06 23:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02808030b49177b8ec25ac833c15091b SHA-1: 740323c7b8424f220a2c4f05eb003331b82e8589 SHA-256: 7b697bc95b31e8030769d4eee3f81aacf8ae81672f923ff680ec0e948ade6121
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'seumenha.ru'. Heuristics indicate a PDF link farm and ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated, but the presence of external links and the heuristic firings suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=what+she+left+behind+tracy+bilen+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fdfd3f360f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5ff96696e2f27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fff311a7dbae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457868/normal_600254a85b9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_603b558f3dd36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60304ed265edb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5fcb589e1f7e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff71190efe87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fe6aabc8302e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_600ecb0a85288.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/puxibofetexemilb0s15.pdfIn PDF document text
    • http://streichpack.online/appreciative_advisingm4h54.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/59a5a702-649e-4eca-a45b-e44104a352c7/how_to_get_to_mt_fuji_by_bullet_train.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_40df7ee3882e4d469a8acd486465ca07.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_7be36b3d557b422a95eea273e6d87be3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cae53a-4c2e-4db9-b530-8c799658b24f/primary_one_mathematics_questions.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_edc0998ef09b488ba503227b79cc3aeb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff7e6db-d3e6-40dc-a51c-517ad9dec658/bajilugizeruzisufubobiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb7fbac-83df-4d6d-b896-cd3382d01ccb/holmes_tower_fan_htf3610ar_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d040cadc-10ea-485c-aff6-9886aee79202/67744838951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6343c3d4-0134-476a-871b-2e985bb09724/wubitosexinudod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7934db-47ad-43c3-8b1a-aa8948b2eceb/55699370243.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_4b5751960db14b79ae7356eefeeef4e2.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_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 5516 bytes
SHA-256: 88979446afc6088c1b1c7e764f07a5584521bb6f7ff85301439bc3637db6b571
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 11236 bytes
SHA-256: 20f20ff3cd1bf7000c9b389560f36093d3d64209b4894f9a23abb40049c531d6