Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f0427b7ceccff4…

MALICIOUS

PDF

72.8 KB Created: 2020-11-20 09:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 644b6c15132bf09b4616571b16434001 SHA-1: d4754a116a9b7a5f7a49d872dfe44ef95dc8af42 SHA-256: 49f0427b7ceccff4efbc051307c2f119f47eea55532cd85f8cf4e4cd7fec1d06
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to other PDF files hosted on various disposable domains. This behavior is characteristic of SEO link farms or phishing campaigns designed to distribute malicious content or manipulate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/aws?utm_term=eve+moon+mining+guide+high+sec
    • https://wejigawavopon.weebly.com/uploads/1/3/4/3/134305277/7975691.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/jimuki-tisogasap-zedakirolulevu.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/813cf1644869f.pdf
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/9910181.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/viruxumabepedi_sulifupunapesor_gegimutajatevar_gamuwewobavowaw.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/bibuxuru-wodosubikutawe-xikak-dilixujedevu.pdf
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/7739190.pdf
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/8800606.pdf
    • https://wizenavadabavor.weebly.com/uploads/1/3/4/5/134518239/fegigumiw-lizaxoje.pdf
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/fogidosezusi_fabasuv.pdf
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/tivenelutiluje-wedegapan-rovuno-kaxatuxibuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jefobexapulow/racing_games_unblocked_games_66.pdf
    • https://s3.amazonaws.com/wemupajese/47065141210.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f3.bin
2a3d3396c6d250dfe8b1346bd21d9b2d7d1bc16332ca40f6fb69493f83a90832		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 5032 bytes
font_01_sfnt_off0000f1ff.bin
dc0d4d9987606191a2ed7b217dfa0b649adf55b5ab4b39b3d09fcf7b43c4ca45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 10772 bytes

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