Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacf200f5bd88669…

MALICIOUS

PDF

79.1 KB Created: 2021-04-02 01:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8a5808a99f2ca0c7441cf56ba930911a SHA-1: afe7ab6e96cd81a02d47f2accc7ecb08bc0956c0 SHA-256: dacf200f5bd88669b914ed6a96a91d497f7886e4849cdcf345a52234783906ab
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Amazon S3 buckets, but one specific URL, 'https://xezojetit.ru/strik?utm_term=best+self+propelled+electric+start+lawn+mower+2020', is identified as an SEO redirector. This suggests a phishing or content-luring scheme, where the document acts as an attachment to a spearphishing email. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=best+self+propelled+electric+start+lawn+mower+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422918/normal_6031385012fff.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/64265941229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60128dda3e75e.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/kumamabovepujugin.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/9757299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_603dd1a61a09e.pdfIn PDF document text
    • http://wejafopag.mypressonline.com/product_brochure_design.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/epyAyVM/98467713336.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/503bd.pdfIn PDF document text
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/rilujijoruf.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/fZM7gi5/swing_states_electoral_college.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/lLHz70x/66093064205.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/75566989026.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/how_did_the_civil_war_and_reconstruction_change_america.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489975/normal_5fff1b61d2bda.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/que_es_un_cateter_venoso_central.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/tipikaxe/rivofuzuzaroteweto.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/latest_samsung_android_phones_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/74412111227.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/22857657510.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/astragalo_vertical_congenito.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/93322112038.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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5716 bytes
SHA-256: bf8b411c6fa9b348ccbab7d015ccf64763e392241d31f417b217f83cfc4db42c
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 11116 bytes
SHA-256: 447d4197c8cd3c95c71cfbca381b7c05360bb94936876c35e630cfae7be0065a