Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9dd3e74d3e798b…

MALICIOUS

PDF

84.9 KB Created: 2021-04-08 03:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0fcf502bf756a8c9846459ef126e3bff SHA-1: 1a3eef3bf4b81bafec3a4e678d77be8b984c129a SHA-256: 4d9dd3e74d3e798b61f770e8325362f42753732049488f8bc11d3129c148ddd9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=lg+wt4970cw+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477921/normal_602ad5569e821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_600660f352cd1.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/1908734.pdfIn PDF document text
    • http://hookup666.site/meaning_culture_shockc7ny1.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/fekifuzulefesolit.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/4315552.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/5112766.pdfIn PDF document text
    • http://instapriz365.site/xurowilntao.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/kafoj.pdfIn PDF document text
    • http://lasleymarkt.ru/chirutha_telugu_movie_video_songs_freep70c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_6048beb1f0e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_6041a1ae486d9.pdfIn PDF document text
    • https://pusuranan.weebly.com/uploads/1/3/4/5/134598414/0f714.pdfIn PDF document text
    • https://motetokazifizi.weebly.com/uploads/1/3/4/8/134885494/temogixuradaren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_604777bd13723.pdfIn PDF document text
    • https://nobobigo.weebly.com/uploads/1/3/4/4/134403715/romasimubeleje.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/how_to_make_corn_bags_for_toss_game.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/lojitanebuv_kadak_gakaxozer_melivubex.pdfIn PDF document text
    • https://tukareteran.weebly.com/uploads/1/3/5/3/135307171/5853612.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/anemia_que_es.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/jevedijadiki/962._locate_the_centroid_x_y_of_the_shaded_area.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/18451046668.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/phonological_awareness_activities_for_preschoolers_at_home.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/cancer_de_mama.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/39955096343.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_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 5676 bytes
SHA-256: aeb96990f7145a3659f4f76abe86d8174174ec292ecd5539cabc0f4324ab9a46
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 12080 bytes
SHA-256: 8bc4897e46e662bf8d1be80661e52d81092b72458127238315d76ab752971774