Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8351c3b1d9fa27…

MALICIOUS

PDF

74.2 KB Created: 2021-01-04 02:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 603cd19e80ca07cf149a30afc1d3e6cc SHA-1: 6455aad12b8c3741812e0ebf9ad87d4382ea064c SHA-256: 7f8351c3b1d9fa27aedcf857734ce4b46ead48f09516c4c043dea0dba055f392
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and redirect to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=africa+travel+guide+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f9466a4074ae.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/2199697.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/3c6c9f9a0d29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fee27e71314b.pdfIn PDF document text
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/b18f10af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5fdf9b39e226c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fa25b6732b0e.pdfIn PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/6c63b.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.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/12862f59-cfcf-41d9-8859-4d3289bfaf90/digestive_system_flow_chart_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/711584a4-11ee-40ec-bd31-a654b9afd25f/kenowimeribut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fcfa1b-5890-4033-a62e-a206ad5662aa/ricky_nelson_discografa_tpb_pato.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_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 5040 bytes
SHA-256: 616278248a794790e94f0b3171769918ad0ee30a547246e6d89071ad337c3dc7
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10740 bytes
SHA-256: 0be1b56d7c1f30983ec4d770167d39c66b64e376b13d1b9bf7b78b8ce22b2e84
font_02_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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