Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e81e886ebec8c25…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 02:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 84e54cc7b09cd8d1bc8c50c7803cc378 SHA-1: d596161193eb47f2fc6881f8d423c968638a2985 SHA-256: 2e81e886ebec8c251b1c97812d5384999a2a194a63f3309a500b0e1fc98ed5f1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for exploit delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=worksheet+6-2+chemical+reaction+types PDF link annotation
    • https://cdn.sqhk.co/burexewejam/ihHUF5S/mokukode.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/jYhcm20/gomekobolemuned.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/jibheRW/fall_guys_game_download_for_android_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/gx7Dgh8/paint_by_numbers_creator_pro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5ff926e395a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_605852210981c.pdfIn PDF document text
    • https://cdn.sqhk.co/vavegewumur/jgFhfhi/wefoxumajif.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/best_end_of_the_world_movies_on_prime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf830a4a67d.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/ausencia_de_cuerpo_calloso.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/ijjigga/toddler_learning_videos_peppa_pig.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/pasawexawinogad/16804777260.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/judonotazojovigelefudobi.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_543868944b9d4420b85d7801cae37bea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/rin_tin_tin_cartoon_movie.pdfIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_4d57e6270ad14403afe29165afe7bcb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/anjaniputra_movie_video_songs_free.pdfIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_51f606d5de2347688624f8f7f57e307d.pdf?index=trueIn PDF document text
    • http://kivozusemu.atwebpages.com/gimp_2.10_wont_install_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/9792042627.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_2daab38e2bb64837ad1b72e28c28dc7c.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/81918193371.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5668 bytes
SHA-256: 8c81611055ca72baaf3114a94e8594ce430bdee65811ac7d2f0bb3858af3a466
font_01_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 10244 bytes
SHA-256: 60b8a6af37faad5de74e49eb2d5c30dcbe8ddcfbf7335aeeecb9b74873bd9787