Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd78c4341c51a009…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 11:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f911186ad1c18271fd9af63356799ef0 SHA-1: de7c35631c20f5b20d39cc54d0d3c5393a43c3e0 SHA-256: dd78c4341c51a009e515f8e78df390ad466653900a81feadac180482f81ec4f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a significant number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

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://druttle.ru/wix?keyword=ordinary+muslim+man PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381531/normal_602e3300c04b6.pdfIn PDF document text
    • https://cdn.sqhk.co/fitigeru/f0Phbih/fevedirijinukot.pdfIn PDF document text
    • http://ranking-se.com/92799599070k0s1w.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/nanutab_rinukiguti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_6006facc5b717.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/mayhem_amoeba_defense.pdfIn PDF document text
    • http://cactusvpn.live/adobe_photoshop_7.0_trke_yamakxihc.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/20ACfjj/sokofifadamenifoseli.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/cGFjegI/vapenugiritarokebo.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/hdhfshg/klondike_solitaire_free_no_ads.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kudawarov.epizy.com/video_converter_to_avi_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/bollywood_romantic_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/how_do_i_connect_my_bose_remote_to_my_soundbar.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/bls_2016_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/negutopenemid.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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5100 bytes
SHA-256: 71e6555733548c7dde8f1b2e39bab78548546cebea9396bf756aba5ab73e70e2
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10288 bytes
SHA-256: 36f06a149b2c9c71bf862e22e8e017eb58575e32c2d25f85d50fb03cb093cb0d

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