Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cc51a47005fc11…

MALICIOUS

PDF

71.2 KB Created: 2021-03-29 01:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dadfc8b5cdc1694ca160dee0b4d88595 SHA-1: b608f37047f543131250079bfc3a3368908bd011 SHA-256: f5cc51a47005fc1158779e133cac8180fa1c3a5a3e53500681d97fb1c4f6c971
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://kuzutuzo.ru/123?utm_term=jai+bajrangbali+song PDF link annotation
    • http://gateguge.22web.org/bible_yoruba_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60512491249e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_5fd90ca63a8aa.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/94916944878.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/belabaj.pdfIn PDF document text
    • http://supesanav.iblogger.org/what_is_management_science_and_engineering_stanford.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/fefudepi_vasitijiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff09df75a407.pdfIn PDF document text
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/widiwuko-sebebuwuk-gekudelagi-fajutisusodogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454556/normal_5fcb533c9174a.pdfIn PDF document text
    • https://zekedijudanafow.weebly.com/uploads/1/3/0/8/130874467/pugijigu_mipukuj_zomofezelinem.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/95126856595.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/wakejuwe-zimevudo-nunaxalo-noreg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_601c69d8ee4d7.pdfIn PDF document text
    • http://varigiz.iblogger.org/why_is_my_vizio_tv_screen_dark_on_one_side.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/fender_super_champ_x2_special_edition.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/32540234289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojozore.myartsonline.com/39704253484.pdfIn PDF document text
    • http://lewomunenuvi.myartsonline.com/95703390447.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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 5056 bytes
SHA-256: a16f8b7ba5aacb3c464242f9ef238a4b481b7a45e11893dfb73e517787dbb3b9
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 11084 bytes
SHA-256: 897365023ee74d829f94f300dca44ce8fc0d6bfe44d933f62b87697871ca193b

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