Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c975e89418f845b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 10:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fa7afab359ded4a7290f14fdb26c4b81 SHA-1: dfe9641cdcec2083e24afa443954f807fadcf620 SHA-256: 1c975e89418f845b08f93f529eab6d12e2d828643f6da71d2c5eb1374b5ac6b4
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as http://securitycheckingbrowservkcom.xyz/31290126717ey69j.pdf, are likely intended to lead users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://crophysi.ru/strik?utm_term=who+is+lenore+edgar+allan+poe In PDF document text
    • http://securitycheckingbrowservkcom.xyz/31290126717ey69j.pdfIn PDF document text
    • http://ctyr.ru/communicate_with_cambridge_class_1_answersg6g7k.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/ghZieeO/27365609020.pdfIn PDF document text
    • http://segway-wheelchair.ru/bleach_vs_naruto_1._1._0_apkjo4n0.pdfIn PDF document text
    • http://mobile-media.moscow/95696230963ynfse.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/ieBs1ie/42387889956.pdfIn PDF document text
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/9650866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_600be4a7955f2.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/ribewerutizefog_mexokajejefixen.pdfIn PDF document text
    • http://topmassage.net/strength_in_what_remains_book_summarypt4es.pdfIn PDF document text
    • https://demenuxukuxit.weebly.com/uploads/1/3/1/4/131438289/1e80b2df9930.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/jipabojusemilaji.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/mokugo.pdfIn PDF document text
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/vamebig.pdfIn PDF document text
    • http://bigno.space/latest_bollywood_movies_720p0blrm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 5236 bytes
SHA-256: 78487d0d36e300a2f62a626e6ed3a7150ac7cec5787f28077220c37ca67dc61c
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 11168 bytes
SHA-256: 93512eebe5f6b7c6a753da25e9253b77efea9308dee04d64b945457bc18195e4

Open this report in the interactive analyzer, or submit your own file for analysis.