Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d7d0832934a43f…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 08:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 35b1b257c36fd0d9fc8fa16bc4dc6369 SHA-1: b7a51b127f47f240a5b61a6aeda1987230831245 SHA-256: c8d7d0832934a43f77597db28299aa2b4f6b8b68a5fbac764fc0f955971e48fd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=mtd+yard+machine+riding+mower+belt+diagram PDF link annotation
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/7108292.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/test_poziomujcy_angielski_b2.pdfIn PDF document text
    • http://fujexitekubolok.22web.org/origin_of_basic_biological_molecules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_6035f5bb7ee95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_600320002dac3.pdfIn PDF document text
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/1203140.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/tajilanafelim-kigagojuzub-tovebawo.pdfIn PDF document text
    • https://rekaxarekarefov.weebly.com/uploads/1/3/5/3/135300852/gujumavuzubuji_tapizu_wabiz_defex.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/f7c264d6a567.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/how_long_to_cook_a_pork_roast_in_a_rotisserie.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/xoxenevigukewil.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/lg_4g_lte_price_in_ghana.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/4ec59436384.pdfIn PDF document text
    • http://gesetaxoxu.sportsontheweb.net/bosch_ccsd_curd.pdfIn PDF document text
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/wibajubifomem.pdfIn PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/judofumuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikelamizogu.myartsonline.com/apache_poi_workbook_to.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_b74791569fd84b489b21698ee2c63f1f.pdf?index=trueIn PDF document text
    • http://dilabopitomosif.epizy.com/manejo_de_sinusitis_cronica.pdfIn PDF document text
    • http://xixoxamevat.epizy.com/an_post_track_and_trace_number_format.pdfIn PDF document text
    • http://robireroruvudi.epizy.com/85244909013.pdfIn PDF document text
    • http://lununobasafino.rf.gd/semarot.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_f9e3ae3848ea4edbb79f7c5a477d903a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 5512 bytes
SHA-256: 2afe7a70c7da6bc93793b5569f886fba4ee619a02a328ccb90c0689c70500ef9
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 11388 bytes
SHA-256: 786792c955a675c2cbaf372775a181b85710e11bc58b26a3d1f72d8171445f7b