Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d9cf89da2ce4b7…

MALICIOUS

PDF

78.8 KB Created: 2021-05-07 06:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5a5576527a681ea7f81eff9396c68e59 SHA-1: 4b9d2bbd93aabf6499e048b229048f83385892b1 SHA-256: d4d9cf89da2ce4b713e2fff893a214821e0c10b38a93c557dcdd2606f3d206d2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, likely leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=hp+photosmart+5520+printer+ink+cartridge In PDF document text
    • https://terabuzaxora.weebly.com/uploads/1/3/0/8/130814115/tovebinefi.pdfIn PDF document text
    • https://sokevabo.weebly.com/uploads/1/3/4/6/134665749/lepebigev-bobekelubofiw.pdfIn PDF document text
    • http://venira.su/fmea_software_templatexgcoh.pdfIn PDF document text
    • http://artistichomesolutions.com/vogoma47mkl.pdfIn PDF document text
    • http://liwadaxezaf.getenjoyment.net/bungsaufgaben_brche.pdfIn PDF document text
    • http://hookup755.fun/kujajuxafoxikmyhkz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372073/normal_5ff2fdc302fd7.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/9403160.pdfIn PDF document text
    • http://smartcreditcheck.info/what_are_the_most_misused_wordsosxr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_60475f149399f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fef37b91cbc9.pdfIn PDF document text
    • http://ipatovaalena.ru/what_are_the_4_theories_of_human_motivationvs9qu.pdfIn PDF document text
    • http://dwatches.site/dave_ramsey_house_budget_calculatorg5y9i.pdfIn PDF document text
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/182995.pdfIn PDF document text
    • http://kprovk.xyz/wixinawune1szgg.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/97873272824.pdfIn PDF document text
    • http://helplnstagram-confirm.com/87351633146ad3fn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_1f7b308af8ef402eb6930e3776230efe.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_3cd656065245455481c0a3ab616edba5.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_333c85f4d33a48daa64740fb6187a296.pdf?index=trueIn PDF document text
    • http://tajavuminona.atwebpages.com/aeolian_harp_an_anthology_of_poetry_in_english.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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 5876 bytes
SHA-256: 6b1a639d02817f9f4c32bb1fdc9af7211c7fd8b79e4732d283bfaa4839898af0
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 10824 bytes
SHA-256: f42340903f311a9ba18b5bc96cffd63dc6d0c1cf87a50740f98360481f94eb8a