Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cbff5aa3bb1ed9…

MALICIOUS

PDF

74.8 KB Created: 2020-12-29 13:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d7dabe89200577c66a133ae58a90a91 SHA-1: 7018f47745a69c6b1bdc04eb90217c156b59bd76 SHA-256: f1cbff5aa3bb1ed90545466f5e0c69cf5abf15a12d8322760ec409bc3872d3f7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one pointing to a potentially malicious domain ('trafficel.ru'). The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links rather than convey information.

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
  • 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://trafficel.ru/strik?utm_term=strikemaster+ice+auger+parts+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5fce6fb799e8c.pdfIn PDF document text
    • https://cdn.sqhk.co/xusorawoka/etNghhe/rock_music_charts_2020.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/a58485ad2.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/9213121.pdfIn PDF document text
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/dekofilas-jamejasomok-zogufe.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/kafipi.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/967a2.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WLeJiB4/kugolirabamenabifinimura.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/baruxirejexo-bakimegegib.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/32b0df81ec782e4.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/4a08c3f5-adc6-41bc-a84b-3194a3b0fc2f/gewunugalogajukuxupaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3b8d76-e07c-4b10-b469-fc7077995ab5/kepudasowan.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 5196 bytes
SHA-256: 03747458e34377bc1253b310e7d9073b5f27e975cc064c041defbb844d7b73f6
font_01_sfnt_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 11152 bytes
SHA-256: 3c3398468c715ff5806f15927f0cee2cf6b80d559dc645e85d1dbb8d9c2bc13b
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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