Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf91f3d5699a188c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-25 01:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a91d1c7c9a92d78b2ccd176aecbe2563 SHA-1: 7db578e7b37553190c12ad47056c8585dc436976 SHA-256: cf91f3d5699a188c1d76f67702f39786acf1866f4d1504f042207fe20266ca80
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://crophysi.ru/award?keyword=homemade+fishing+bait+for+catfish'. Additionally, it exhibits characteristics of a PDF SEO link farm, containing numerous external links. The ML classifier also strongly flagged this PDF as malicious, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=homemade+fishing+bait+for+catfish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_600ae3c4d66a0.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/pamogizusov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_603257719c6bc.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/P3WI2he/pico_island_weather_august.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/wulesozisuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_600787f4898e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5fcaf3afe61ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_601421ef966b8.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/xefufamuw.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/zedipute.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/wukara/13431879455.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/camera_preview_orientation_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/geket.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/lotupi.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/40158817835.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/33688738307.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/zesupufukegawimebeteluger.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 3304 bytes
SHA-256: 7db4aa9dcfc42b3a6ef9a04f555e0b2fea6a31cf0b1e3bf67d3f0cf3b72bc559
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5504 bytes
SHA-256: 797fd1f8b538d9534a3f537dd852930a8080ce6bb14185b416e6af8f006eb3c1
font_02_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10132 bytes
SHA-256: be47ee7ae96ece434ef24f26c2caacdb957b6855b29162b0bccebdb103fb3125

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