Malicious PDF — malware analysis report

Static analysis result for SHA-256 2930eab88e846244…

MALICIOUS

PDF

69.6 KB Created: 2021-02-11 15:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf38986bc2a92725c87288abbe441d9a SHA-1: 3a07409a91f47c1a979912034e45292c7620927d SHA-256: 2930eab88e8462444a623601e72e4b6254e64fa839a72171f36ce4a31ba35a2a
254 Risk Score

Malware Insights

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

The PDF contains numerous links to SEO redirector domains, including one at 'https://crophysi.ru/123?utm_term=increase+minecraft+fps+1.14', which is flagged as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'minecraft fps'. The presence of multiple PDF links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/123?utm_term=increase+minecraft+fps+1.14 In PDF document text
    • https://cdn.sqhk.co/mukibusu/jj7SheQ/nizusiwinunagad.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ijDbEig/76178075004.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/b4c4aed41f16.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/vapet.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/7799774.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/xijovumulebexazera.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/SXiicib/2636164671.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/juzifazatozigo.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/kotidox/antivirus_para_android_cual_es_el_mejor.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/18644596528.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/xakupaje.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/6097479820.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/jojinekugasuw.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/lumberjack_baby_shower_sheet_cake.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/lewake.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/year_3_grammar_worksheets_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/unicode_nepali_converter.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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 5240 bytes
SHA-256: 228c72abcb8e3293f13f9fd0102ff33b984f548ce6ace7d1c6be07e40ed846ef
font_01_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 9700 bytes
SHA-256: 434d65ca06319c3523f6cd3ca5fea6e63fcac61ee0f8bc7b0f00c294df647769

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