Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53a14a24ef484b2…

MALICIOUS

PDF

78.4 KB Created: 2021-05-12 08:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fcfd9bb8459a247c5646fa7914cd94d5 SHA-1: ef9842ae5d9e69872da11b64b83ba83b44b53d57 SHA-256: d53a14a24ef484b2757069d7e8cc9e79968dd63dfd11aadb8dd03924606c466e
206 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to disposable domains or are used in a link farm, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://botokaw.ru/strik?utm_term=marcy+weight+bench+parts+list PDF link annotation
    • http://naturfresh.fun/la_fiesta_de_las_salchichas_espaol_latinonnk3w.pdfIn PDF document text
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/2699714.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/62b9246f21e66.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/ledulivibemori.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/0951225f87544f.pdfIn PDF document text
    • http://realnoe-obshenie.online/windows_10_upgrade_from_vista_free_downloadfwh36.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/b5b197.pdfIn PDF document text
    • https://bemesamug.weebly.com/uploads/1/3/4/7/134722017/27977d7826cb6.pdfIn PDF document text
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/vizekili.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/kapunatag-lufawa-merixuxizabazot-vupabofu.pdfIn PDF document text
    • https://kogofidovobe.weebly.com/uploads/1/3/1/8/131871531/jibawomewafenojopov.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/0d123252-0139-457b-91dd-ff726ff07938/what_were_the_provisions_of_the_radical_republicans_reconstruction_plan.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_ebd35451d4ee4c74a5f81a5937e6f0d6.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_51976e04f4694578bf330cec91e4a81a.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_5a81d08e6a6c4fa4ad9f6dbdf63ab907.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbe0722-bccd-47b1-a21b-3a065b7c4782/theatre_the_lively_art_10th_edition_ebook.pdfIn PDF document text
    • https://86860ce8-2957-478e-97c3-2abddc2d2c3c.filesusr.com/ugd/754ed1_0dd2efe9132542e4be4e86638f43c8c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cce78a-0937-47c1-97e9-8aa0d8ebb0dd/jewunabewoxikawokuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974761f8-a7d1-42f0-a75c-392b78ef7742/jevovig.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_05e2779bac49471292266a3417179496.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a4af9d-e969-429d-8dba-31b960c6eeaf/77005938486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30027cb-4bd6-4773-8433-7c946e0e6715/mupijogapabobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616a0287-46a6-4823-a62c-7e7436ff50c1/ipad_mini_5_case_with_pencil_holder_australia.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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 5532 bytes
SHA-256: 8da032d14acebccdef142f07eabf41ff4f27c2171bcfc153606a92d43f491179
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 12296 bytes
SHA-256: b4a407feeb070044f27615424751674cd8dd0f47c6d01a79498f6098c5251d48

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