Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf58d2de6cbfb80…

MALICIOUS

PDF

84.3 KB Created: 2021-04-12 09:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: adae0a55d88a3a851552b982732c993d SHA-1: eaa653fe55717c25b81c122d795c30bbb7f7358c SHA-256: cbf58d2de6cbfb80cc577623fcc6df34eb3d90a29ff4ed20fb22a686965fd129
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=tc+helicon+voicelive+play+service+manual PDF link annotation
    • https://cdn.sqhk.co/rokunufoleti/bK1gjaq/23077314041.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/7123753.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/ibnsib2/xurabu.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/vjh8oSv/potuderavup.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/nevugu-vokutikotumes-fufoz-gumevusikaje.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/how_to_put_ink_in_hp_deskjet_2545.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/dVgcij9/island_of_the_blue_dolphins_reading_level.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/3204678.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/7116909.pdfIn PDF document text
    • https://sinuvofibudibaf.weebly.com/uploads/1/3/2/6/132696377/nokevevos.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/mitenijopitovodexa.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • https://novifofogabux.weebly.com/uploads/1/3/4/3/134371065/pebivesow.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://uploads.strikinglycdn.com/files/e653a3f5-185f-4234-b8dd-3df68707969f/kapume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2cfd96c-efd9-4d8c-be3a-c7fcb442e54d/zonabunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef599e47-3996-49e9-91c9-d0b46146518e/true_freezer_t-23f_temperature_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30d5aee-2e9b-4dd7-bff9-4c4001c37eab/93763683979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae0021e-0361-4753-a17f-b0b5845b84a3/trilogy_ventilator_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad4ff54-6def-4dd2-b5bd-92ced328624e/vutudalavopefajas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b9d584-7fa0-4d6e-aa56-c77859644ece/54985949408.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 5088 bytes
SHA-256: d26b818a7372258d7b45e66c932f7397b7231fd4a735989dcdabe53ae6ea3f88
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 11024 bytes
SHA-256: 34ff86029e1a90481701bd923b2ff65b620c8628c116885c99a1fff759b5768d
font_02_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e