Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82e631ca7e72f1e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 08:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6f020a9f785577ee0c43697636aa2085 SHA-1: d8261514e16b7ac1aa3865e8d449d4866b480811 SHA-256: e82e631ca7e72f1e02d91708261d07fa15ab9ff2625ef37fc03d9fa96ae8cf0f
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as a PDF to Word converter. The primary heuristic firings indicate a high likelihood of malicious intent, with ML and ClamAV flagging it as a phishing or malicious PDF. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/award?keyword=pdf+to+word+converter+online+free+arabic PDF link annotation
    • https://xizuzesujebowu.weebly.com/uploads/1/3/4/6/134666185/0215af983974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_6063ac199f66b.pdfIn PDF document text
    • https://nujujuzizupefe.weebly.com/uploads/1/3/1/6/131606206/jatavuxamiwupuf-semigovurafus-junenomupub-nupotaxava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_601bb7d38667e.pdfIn PDF document text
    • http://niludop.22web.org/comprehensive_aphasia_test.pdfIn PDF document text
    • http://gikixeg.22web.org/92996711263.pdfIn PDF document text
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/2801585.pdfIn PDF document text
    • https://jasujoru.weebly.com/uploads/1/3/1/4/131483343/popuzoxopuv-fininep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_604cd8893e79b.pdfIn PDF document text
    • http://boburokopuxixud.iblogger.org/medamibikotezefuga.pdfIn PDF document text
    • http://wumupowon.22web.org/2869157651.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/wowufonibub.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://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_6d92ecd645b5471ca60510dcbff41cf5.pdf?index=trueIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_89fcb57a0e234fb994e33fa2c56e1789.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_489032b19973439fa32d91ead8a3a129.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_7c1eb8d53da84cb5a07bc66214f515d7.pdf?index=trueIn PDF document text
    • http://tozibuxadotoba.epizy.com/92561229693.pdfIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_5a31d3612712423c815af87e5b90d9ec.pdf?index=trueIn PDF document text
    • http://paxomutu.rf.gd/alternator_diagram_wiring.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/latex_book_template.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_bdc1e37ed0bf44439b13079b39bd4f1d.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_2a97ab6fab2d4baa973df8daf4b9b58c.pdf?index=trueIn 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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 4916 bytes
SHA-256: d012b4007c49454aa3e003e3dd3bd975b1492c6903bac411da7ce64aa6f6c799
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 11248 bytes
SHA-256: 2420c7b476c4a46fb7c9b4160b3a0d25b2d275f5b885c65e8c5603486e76ff2e
font_02_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e