Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b4101f017ca80e…

MALICIOUS

PDF

75.6 KB Created: 2021-01-31 03:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ce380d140f7ad23cd4371bc8cbdb71b5 SHA-1: 2262aa2271ec30ccc5be351e04bcfde768f42585 SHA-256: 37b4101f017ca80e76fbbbf865e3043fe5eb4cbfefe44dae691ed283f993ed12
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/aws?utm_term=pikes.+io+brutal+squad+mod+apk PDF link annotation
    • http://dommasters.site/fovofamapelpfvd.pdfIn PDF document text
    • http://gasojowil.22web.org/talking_tom_2_apk_uptodown.pdfIn PDF document text
    • http://bedomukuruxe.22web.org/additional_mathematics_form_4_chapter_11.pdfIn PDF document text
    • https://fifesijewawo.weebly.com/uploads/1/3/1/4/131412558/luwogorugelu_gasifidotes.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/eUwZUhi/vewasalapuledel.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/btfujib/star_wars_live_wallpaper_iphone_download.pdfIn PDF document text
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/wabube-rumofesak-lolenum.pdfIn PDF document text
    • http://fb-pageunderreview.com/zombie_catchers_apk_mod_2019jtn3b.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/jjv9N7R/87140763054.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hfc0vgj/class_9_maths_ncert_solutions_chapter_6._1.pdfIn PDF document text
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/fukabokapale-metafojafarize-ruxaderuvo-pezuzosa.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/gRicAjj/9th_class_admission_form_2020_download.pdfIn PDF document text
    • http://lagujegivupani.22web.org/wosuberolixibudemijin.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/wobixevumir.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/tevimos-pikib-zebonibavig-lezagus.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/waxegatulo/57279349965.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/carl_sagan_pale_blue_dot_video.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/write_equation_in_slope_intercept_form_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/8745681208.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/oneplus_7_android_10_root.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 5468 bytes
SHA-256: 3807edf43bddea77b64aa8f407c4e8ac52f1981469ad4e95c0fed2397d21d4e1
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 11856 bytes
SHA-256: aab1c82fe23696f82fddbdbace7c30bb005d472e02de726494b1e32a7fb786f9