Malicious PDF — malware analysis report

Static analysis result for SHA-256 7400b3a81e4cdc9c…

MALICIOUS

PDF

80.4 KB Created: 2021-02-23 11:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 14a841d60f63803ed722619a498e5d49 SHA-1: c47cf021e96d1cea1fd8c601cd5af7a156f66aa8 SHA-256: 7400b3a81e4cdc9ca244545d8bcf282bdc3e4f78f33e4789d45da03512b90dbc
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to potentially malicious or redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though partially corrupted, suggests a lure related to prayer for rain, which is likely a pretext to disguise the malicious intent of the embedded links. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=how+to+pray+to+god+for+rain In PDF document text
    • http://sreda.city/lujowebawizowararh1pp.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/pefasotoxuzonupux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_6019d54f5ae89.pdfIn PDF document text
    • http://topcreditreport.info/navy_e5_eval_closing_bullets3cikf.pdfIn PDF document text
    • http://italiahot.fun/les_eddasx5tev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5fec15512784f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5fe89e46a9320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503033/normal_5ffbfaa4e98e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_6028b85743741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_6008cd5e9be53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60136e21c8002.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/toliwudalamem/kiremusowimejide.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/best_good_night_wishes_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/ampere_pro_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/xizabibepelepezaseromij.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/cartoon_hd_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/majirigedumimiwuzut.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/zowuzenubevujexupon.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/cambium_ptp_550.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/fft_wotl_onion_knight_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/airlift_performance_3p_golf_7.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_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 5156 bytes
SHA-256: ab5b3a07a81d8be35f3b017c3381605ddc570b58ce2e8771cc2671a3cfc253f2
font_01_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 10452 bytes
SHA-256: 2e21e866dedda18186247ad0e87105b0e9dd6f187e8f70cc2f20b36846d7cea2

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