Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07887efdb5f40bf…

MALICIOUS

PDF

80.1 KB Created: 2021-03-14 01:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ddb5082050e943c364edf351432c145 SHA-1: 284a051502b90445f9081e890b1bd471bceceab5 SHA-256: a07887efdb5f40bf16bfc3d3cd204cb7cdb4e509b2c505378a93610d609e7379
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The primary suspicious URL identified is 'https://midufefew.ru/wix?keyword=20th+century+fox+home+entertainment+logopedia', which is presented as a lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to exploit vulnerabilities or lead users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=20th+century+fox+home+entertainment+logopedia PDF link annotation
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/tetosilalele-xiras.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/65a34b7c1433ea.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/6983938.pdfIn PDF document text
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/20f706d26f03.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/loxijikagamawepexe.pdfIn PDF document text
    • http://rotelebi.22web.org/zuruzupalufojotiri.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/61439c83ba50.pdfIn PDF document text
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/ccd6e47901d2e.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/lebaxa/tds_challan_format.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/how_to_repair_kenmore_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/86661198565.pdfIn PDF document text
    • http://vekubuj.rf.gd/zajoluzojaboximipejunek.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/integrated_reporting_ey.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/2163709428.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/why_isnt_my_eureka_vacuum_not_picking_up.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/domubefoba.pdfIn PDF document text
    • http://pawegafed.rf.gd/zijazase.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/tracking_attendance_using_google_forms_and_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/gebojiluxoboxeburega.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/frp_bypass_5._1_1_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/oracle_sql_change_date_format_in_select_statement.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_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 5740 bytes
SHA-256: cfadb4ec4d279ca06fe22a310b69db4a470727f54110f024ea61727da1d169ee
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 10852 bytes
SHA-256: e89037f414f73093357c364de9c18b112779364246a07b2f40f6d84bf714974d

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