Malicious PDF — malware analysis report

Static analysis result for SHA-256 3709f62a1513d541…

MALICIOUS

PDF

84.2 KB Created: 2021-03-12 06:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0352bcc3873127233c75fad77616c141 SHA-1: c8cc441c93f4b5de868cead6cb4f45a115ff25c1 SHA-256: 3709f62a1513d541beba5d052d90b72e1e992dfdc21104f1f33b65b300b57cc7
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 0.9961

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://kuzutuzo.ru/award?keyword=bypass+gastrico+laparoscopico+pdf PDF link annotation
    • https://cdn.sqhk.co/zolulesar/gkSicii/sad_love_wallpaper_gif.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/kizigixawikifotemif.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/pofodumipajunafotanew.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/AjfPJji/all_smashes_my_hero_academia_dub.pdfIn PDF document text
    • http://devovonabukuzim.66ghz.com/kudanoxosejabolofo.pdfIn PDF document text
    • https://degiviwab.weebly.com/uploads/1/3/2/6/132680905/a4f214db7a6.pdfIn PDF document text
    • http://vukesis.iblogger.org/radozabularawugizupirinis.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/5847662.pdfIn PDF document text
    • http://padlamadla.site/33087444210m70v6.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/gefapowavu.pdfIn PDF document text
    • http://firstreadersclub.com/siege_and_storm_chapter_summary9zbwy.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/nbKh6gd/2701600363.pdfIn PDF document text
    • http://oneitshop.info/895505078335kgzr.pdfIn PDF document text
    • http://detonicro.website/5bseru.pdfIn PDF document text
    • https://tunutepefa.weebly.com/uploads/1/3/1/4/131453603/c4402299f5c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_9b0c83afcf1e4e1ebd3e6db59c95b701.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_f653bbc9c34b43209ec786a4801aea38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4963097b-c764-487c-bc0f-683d6f76d5ef/fazekov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83759a5-0895-48cf-87f5-ccd6ae61320a/96_jeep_cherokee_xj_mpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b02b8b-a434-4e79-a7c1-dd25954f9b90/84184124411.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_accfadb20d6b48b5a50252b586617eab.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_0fc3725a75cd4d77bddffe2036f0f618.pdf?index=trueIn PDF document text
    • http://tikilodi.epizy.com/central_idea_of_a_demonstration_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f198fd-d2ae-4a92-9d96-c069a709f73f/como_ser_un_lider_mas_efectivo.pdfIn PDF document text
    • http://zidufixeda.epizy.com/53416377274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905d43cc-4202-498a-ba58-70cbe7e7133c/how_to_change_time_and_date_on_timex_ironman_watch.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_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 5476 bytes
SHA-256: 3987d1632021845e729a9b1f055ae5c7596046ac6637960280b43cd4330fa8bf
font_01_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 12284 bytes
SHA-256: 18210cc2805585db6f3a75b1ade03e9c43e60768ea74ea9e4ba1ff915246b913