Malicious PDF — malware analysis report

Static analysis result for SHA-256 65df29d73ea20193…

MALICIOUS

PDF

136.4 KB Created: 2021-03-31 05:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91cdf5586130fcc0ca6ec9ce07970c6e SHA-1: 10268717e765f88406061cd9b31b9cfc616960a3 SHA-256: 65df29d73ea20193e47fe728762f684410f5d6349aba5ebde6e5683dbc21b036
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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.
  • 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://resalured.ru/wix?keyword=white+spruce+adaptations+for+survival
    • https://zojunakalej.weebly.com/uploads/1/3/2/6/132682915/junenabadewofeki.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_6009d59c286a5.pdf
    • https://moramiwise.weebly.com/uploads/1/3/4/7/134736235/ebfb86b07.pdf
    • https://cdn.sqhk.co/bobofibu/eiehgii/sago_mini_superhero_apk.pdf
    • https://cdn.sqhk.co/kubepugemaki/gvgjN9L/wwe_news_cageside_seats.pdf
    • https://cdn.sqhk.co/lewiwifo/hgdhihg/mifamesusunuzelabifasil.pdf
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/6048039.pdf
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/1478513.pdf
    • http://pugalibapuf.iblogger.org/maze_of_bones_book_trailer.pdf
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/riwoguralut.pdf
    • http://segakibosuvi.22web.org/jotiwabekovejemusul.pdf
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/bubizozafimedirenaj.pdf
    • https://cdn-cms.f-static.net/uploads/4409619/normal_602b4ddfac8ed.pdf
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/rajawafabefoverunuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/000dc8fa-5a98-476e-8d99-3167dd5cfc96/76598499150.pdf
    • http://mejovusemuvov.rf.gd/44677059354.pdf
    • https://uploads.strikinglycdn.com/files/84164036-d6c7-46ab-9d7e-c6cb0de7ceae/what_does_john_the_ripper_do.pdf
    • http://lezegunotoxom.rf.gd/english_reading_book_free.pdf
    • https://uploads.strikinglycdn.com/files/33cb08ee-4423-4de4-b511-6ce250ec6ee3/what_is_the_religion_of_taoism.pdf
    • http://wekaniloba.rf.gd/kemef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bf3b.bin
5d3a0505e723c566e0c5fcff841574ec56a5a5eac05fb7eaed88b86a350631a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF3B 5316 bytes
font_01_sfnt_off0001d160.bin
721641afc5254aa4447730a79881405c8020a17a1a0d88f4538ca0f47d4586ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D160 13124 bytes
font_02_sfnt_off0001fcb8.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB8 16148 bytes

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