Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18c6ca1e063d276…

MALICIOUS

PDF

62.0 KB Created: 2021-03-17 16:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 760804f11ae4ed8d963ef6572b26d98d SHA-1: 19f8598678b94ea1d8faa9a2c4d4f7866949773e SHA-256: d18c6ca1e063d27611ffd89fc8644e4c161191ca672409ec49541e82bfad51ed
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one URL pointing to a suspicious domain ('midufefew.ru'). The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or SEO manipulation purposes. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=manual+weed+trimmers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409420/normal_6023e22029cbf.pdfIn PDF document text
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/natogiwufiwidadetus.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/hdjg2ie/mini_golf_nyc_manhattan.pdfIn PDF document text
    • https://fikuwigo.weebly.com/uploads/1/3/1/0/131071253/744467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5fe6d4b75497f.pdfIn PDF document text
    • http://tajeromodovo.66ghz.com/icloud_unlocker_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5ffe0bc02b2de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604f35a78b927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_603b40b5e2526.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/gfjahaT/zara_usa_locations_in_maryland.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601219a32b0c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/niveles_de_prevencion_primaria_secundaria_y_terciaria.pdfIn PDF document text
    • http://bixodog.rf.gd/bapibixaja.pdfIn PDF document text
    • http://gorifolowisawi.rf.gd/bebipaxubajipovawotagu.pdfIn PDF document text
    • http://gavasirobodi.rf.gd/99285153494.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/pakabitud.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_off0000ba5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5E 5068 bytes
SHA-256: f986946a50371c12f385a6e45f11c6eed8bb82e25ea07557777d9b8c770963c5
font_01_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 9300 bytes
SHA-256: 5c0f89fba4600a6fd3cf594d6709d9e6f44c198f89f10f20dd9c60f461f03d9a

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