Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8c08b2ac5e7f8f…

MALICIOUS

PDF

84.4 KB Created: 2021-03-13 19:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2eb4051bf0c584448b6dcb48ed6962cb SHA-1: 1a5a0ccf024fb9e9b2346fa8f599c3a8a057ce71 SHA-256: ce8c08b2ac5e7f8ffb8778d3c31d8395ba8e5032a2f14f9a831feee124095bee
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or scam-related websites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan. The embedded URL 'https://bologen.ru/strik?utm_term=pharmaceutical+calculations+practice+problems' is likely part of a phishing campaign, using a seemingly innocuous topic to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=pharmaceutical+calculations+practice+problems PDF link annotation
    • https://faberumul.weebly.com/uploads/1/3/0/7/130739640/540baeb9e82a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5fe29acf0ea08.pdfIn PDF document text
    • http://wildber.store/line_graph_worksheetpmon3.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/lixekogiza.pdfIn PDF document text
    • https://pifisurap.weebly.com/uploads/1/3/4/1/134108900/512383cbc95.pdfIn PDF document text
    • https://palivifu.weebly.com/uploads/1/3/3/9/133986562/bijijisaredo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_600d435cab96d.pdfIn PDF document text
    • http://groshyk.site/pakoluvenadgnwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_60499368ee865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_600ad72e81aef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_33c40611e36a4853b6ddfc477e7df3a3.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_3453e86dbac5409193dfa7993a5837c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/call_of_cthulhu_doors_to_darkness_scenarios.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_dddeed0dc07a4a61a4cf0048c2e2ac53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/lajulaliwul.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/xulogugodikiwowisulujo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/la_barrera_hematoencefalica_esta_formada_por.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/anatomy_cells_and_tissues.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/ap_physics_gravity_force_lab_answers.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_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 5312 bytes
SHA-256: f884ae9b49fbeb03e48f2f6152831d769d33c1b69a77145ed88d9e7d35db792c
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 11612 bytes
SHA-256: 4fa9120ce10eff4155e1c0783b788d7e232360fcc38bcd0594e1f48004dbcaae

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