Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c521a6be9f62b…

MALICIOUS

PDF

84.6 KB Created: 2021-02-19 03:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a6101ca6de0f02617d79d5de137d2eac SHA-1: d9a8a786458e91c84adcfde4b37cbed746626745 SHA-256: f41c521a6be9f62b590b6888cf8c5b7dfe2a6b7566f90c95faea703cc2f578bf
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded links that point to known malicious redirector infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, appears to be a lure related to a school supply list, suggesting a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

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 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://yafferge.ru/123?utm_term=bluejacket+flint+school+supply+list In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367286/normal_5ff2332482850.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/soronutotiminu_baroviki.pdfIn PDF document text
    • http://wow50.pro/79923229157v8bsv.pdfIn PDF document text
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/viwolavudiwi.pdfIn PDF document text
    • http://logvoz.ru/budoviturejumq9vc6.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/0shjage/davudololikuzijojagagob.pdfIn PDF document text
    • http://carishr.com/612139920320k7is.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5fd93c1780da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481665/normal_602d6ee29329e.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/6592189.pdfIn PDF document text
    • http://boomua.site/ralokevegalatakotewesv5eo.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/ibhOBat/sujut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503033/normal_5fe1a6307f84c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5ffb66a91dc9a.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/hhjjpnx/verizon_smart_family_stopped_working.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/fotojipifuzitul/60695283245.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/barbie_dolls_ki_video.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_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 5300 bytes
SHA-256: 693d2253315748e557b5f9157b2621f495b0fbec6badf7c74e441be7316a770e
font_01_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 11700 bytes
SHA-256: 71be171e65d513de91d1c90b193467ad2eebf381ff3f3336214aa8d473e8151a

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