Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d40e482d285b766…

MALICIOUS

PDF

74.5 KB Created: 2021-06-12 18:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 985bc4cfb9d58670437b4663802cc4bf SHA-1: 524189655466d1baf6c7cf57b1c2062d53ff75f2 SHA-256: 4d40e482d285b766ede05be4e7c0a2b519644228a0adc20e9f70612d24b478fb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to deceive users. The primary URL, 'https://medvor.ru/pbw?utm_term=job+application+email+body+sample', indicates a lure related to job applications, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=job+application+email+body+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482619/normal_604712a95748d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ff6d0ca9b7f6.pdfIn PDF document text
    • https://karuxuli.weebly.com/uploads/1/3/4/3/134377251/1289384.pdfIn PDF document text
    • https://mogiwojijefinan.weebly.com/uploads/1/3/4/9/134900510/lovededo.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/foluvekokepasafefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_606696ee225ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_603450e691b3e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4469355/normal_60b004d4a6d15.pdfIn PDF document text
    • https://xokosawebajufad.weebly.com/uploads/1/3/0/7/130776850/2832771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_604d106f6af9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_600c8b70d3e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_60651c200d554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450504/normal_602a1ae8c82af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_602794b232fb5.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/6019c593-4277-413f-9353-58b38465eb4f/nidigobijefobemetobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba01b0c7-8923-4651-ac17-736674016b17/how_to_reset_mifi_7730l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f718c57-fc54-4f9a-b714-638d413c4634/how_much_weight_can_you_lose_if_you_dont_eat_for_5_days.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/different_types_of_computer_hardware_accessories_and_their_respective_functions.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144674586/16760308285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b7bae3-6608-46cb-8036-40af2dfbcd14/my_system_nimzowitsch_epub.pdfIn PDF document text
    • http://zibupiken.pbworks.com/w/file/fetch/145114530/tilijedon.pdfIn PDF document text
    • http://zefavorase.pbworks.com/f/les_pronoms_relatifs_exercices_corrigs.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 5352 bytes
SHA-256: 9f18df7401e3396eff574ef7ef5011903ddd9b253729eb90096d3eb99ef43b75
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10224 bytes
SHA-256: 2714daf5bc0e3fb8128c67a7ec8b1b0f6293cf6eaf7eb278571673e1b26013d0