Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e8197f5f5104dc…

MALICIOUS

PDF

80.0 KB Created: 2021-02-17 06:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fba6ab48684d9f0629a5a94b4b251fc7 SHA-1: 2b343a102922ce3943422fa48d1ba685f4debfb3 SHA-256: 98e8197f5f5104dc938e8640af270412fd7c5c61305e9490ebcd68005e672f2a
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 of which are hosted on disposable domains or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the document body's reference to obtaining a 'red cross first aid certificate' serve as a lure to encourage users to click on the numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=how+to+get+red+cross+first+aid+certificate PDF link annotation
    • https://cdn.sqhk.co/niserutom/gegeZjd/apple_logo_wallpaper_hd_1080p_for_iphone.pdfIn PDF document text
    • https://pokifinib.weebly.com/uploads/1/3/4/0/134017941/21c9e.pdfIn PDF document text
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/zozakemidipo.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/ageEDgf/96178191843.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/djgIpTJ/homemade_ice_cream_recipe_using_carnation_evaporated_milk.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/pedobiz-lexegobumipag-losunukobam-rafiwer.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/xhejaic/5859434217.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/zFWT3jb/2262449363.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/paropabaru/mukosavavi.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/96680949994.pdfIn PDF document text
    • http://jugorufu.epizy.com/49303219251.pdfIn PDF document text
    • http://novuzebires.rf.gd/zumir.pdfIn PDF document text
    • http://bigisewolax.epizy.com/zevuxigizanexujar.pdfIn PDF document text
    • http://tunawibiga.rf.gd/87119158349.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/xurekudupaz.pdfIn PDF document text
    • http://kaxixuzebupajal.epizy.com/40699129354.pdfIn PDF document text
    • http://nipesuvaz.epizy.com/tonitimixepijit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 5212 bytes
SHA-256: e4ed823b95d3f41ed78f84868a4f09d510a08e161f913311e9a26ab3cafeeef8
font_01_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 17692 bytes
SHA-256: 98fe1232e37c8e304c0ef7b0ea6b87c59b89be766712d5f939c0a40ecc6f8e02
font_03_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 16444 bytes
SHA-256: a623f5a3050e0c085fdd3b24e036759a861dfb4c50e9f85a49cffdefd9e27c48

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