Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc58623ff313909…

MALICIOUS

PDF

81.5 KB Created: 2021-04-03 09:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e1f0160f46d502f5589d2bfe276d0d39 SHA-1: e5cf6c8e9c0df705e3707381b60142c0c700edda SHA-256: 7bc58623ff31390930519d8e57bd86bb55afed4de22b49eac26ce25630289861
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and disposable hosting, indicating a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/strik?utm_term=which+box+to+use+on+1099 In PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/e319fb3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_602dc54347267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5feea5aa0d67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_602944f2c0b71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_605056213dfe5.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/8922019.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/dosanulatesoz-wuwopix.pdfIn PDF document text
    • http://sotinifox.22web.org/lubijuwumimibegumokefenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_5fd832c087710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6049ce3d55ab0.pdfIn PDF document text
    • http://wezotodatixazu.iblogger.org/about_web_designing.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/4594164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5fc5706642dfa.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
    • http://gadudadu.rf.gd/the_weather_app_for_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca076fc8-5243-4914-948c-edd378f65c33/romeo_and_juliet_short_summary_act_3_scene_1.pdfIn PDF document text
    • http://jigotukaxeze.epizy.com/animal_name_list.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/63737969170.pdfIn PDF document text
    • http://jokuletufale.epizy.com/63247428715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a4ed48-93e8-41cb-9b67-1c85d2a1926b/resumen_novela_doa_barbara_romulo_gallegos_por_capitulos.pdfIn PDF document text
    • http://dewonatazuji.epizy.com/utilitarianism_business_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4782b79-7ee7-4869-b9cb-f0b9ab6cdd79/fimiwalomaxorikumobo.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 5000 bytes
SHA-256: 996b18a77f9ff6f1cbf29fdf5b295c9a17d46057175bff1063b575181d876073
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 11148 bytes
SHA-256: 276c2c6b6185c7080518df1b9f3df5613831e49f148e54ba07e5c4ec1acef612
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c