Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1628bd6b10d606…

MALICIOUS

PDF

85.1 KB Created: 2021-05-29 14:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3b4ea47910cf059a180ca81576be6cc SHA-1: e1770f90201c6d75d8bf96a89251a08d4a9cc042 SHA-256: 2f1628bd6b10d6060dfe6c6a13e2c284b03c7553e76bad2e8351d6c07991cf1c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nipisod.ru/strik?utm_term=nys+court+officer+exam+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6068c47d55c4d.pdfIn PDF document text
    • https://pegojuzifaxoda.weebly.com/uploads/1/3/5/3/135309499/b2d425.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/9254507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_602f9fcdb7359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fcaf734e98a2.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/57c806.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/xozizo.pdfIn PDF document text
    • https://lorobewan.weebly.com/uploads/1/3/1/8/131871486/1543725.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/jeriliwifadum.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/vejeweja.pdfIn PDF document text
    • https://dodivivedi.weebly.com/uploads/1/3/3/9/133997878/bfb70.pdfIn PDF document text
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/gujiwib.pdfIn PDF document text
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/fulimod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/17605c7d-69de-4d45-a69d-32f504df2b06/xasolufexejavitapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bf8690-14a6-4140-a174-eab482429622/molexuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585dd2d0-92e9-42c0-ae36-c739c13882d4/download_film_divergent_3_sub_indo_lk21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d86d083-48b9-40fd-8e61-5bbb0a66b162/dalenorazajilelodereboda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f143b8-7caa-4cc6-99de-cbe526c2e2cd/86126172240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b79204-428d-4a1d-bf4e-3877b3bee0a3/the_girl_king_full_movie_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7258b73b-6f35-4102-8b2f-d6a058c2791c/nonefupunopepovudoladiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b7eb57-50c5-441a-8f06-83001bb4f25e/rudufasufozugur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c51c647-4d8d-4c91-8147-034ab5ca422d/elements_of_arts_in_egyptian_sculpture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f4ce6e-62c7-4c81-9ebc-464d82741bb1/34693156353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acebfe0-4d1f-40cf-82a6-04f3e6574581/barrons_sat_math_2_13th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dff490-55b7-4612-ae0c-8bb4d657603a/57022869975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ce5f37-be54-4cac-88f5-090e69fbcdb1/focusrite_scarlett_18i8_3rd_gen_usb_audio_interface_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 5224 bytes
SHA-256: e530163ca3986c50fb90483e2a4458086f9a7a11a6f69b4d90e260eb8cfdefd4
font_01_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 11468 bytes
SHA-256: d59e5173d8234676615e0ac2a5cb727fecb6dd2abfc8ca599636f306f35d9bf4
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3