Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2f70bedbd7fc40…

MALICIOUS

PDF

83.9 KB Created: 2021-02-14 07:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23d3cc181a41a05d721549c644f85790 SHA-1: 91894ecd178b70def7f5e054438ece1732ef9a19 SHA-256: de2f70bedbd7fc40338fb991e8add77bb91eac8e25b116ed0f066547adc89bba
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/123?utm_term=impossible+test+christmas+answers+snowman PDF link annotation
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/fejusapu.pdfIn PDF document text
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/tuwupi.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/fd55bb.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/7727718.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/fd8578dad810.pdfIn PDF document text
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/masox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_6008a46798427.pdfIn PDF document text
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/kalafemawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_600f1f6e1c2c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://denotepisijolib.rf.gd/68146914100.pdfIn PDF document text
    • http://nugetagu.epizy.com/jusijizakaziwamuwi.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/bjarne_stroustrup_c.pdfIn PDF document text
    • http://jefebewo.epizy.com/jay-_z_the_black_album.pdfIn PDF document text
    • http://jiguxikawijax.rf.gd/97102417995.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/1791765541.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5344 bytes
SHA-256: 5361c15ad8fac806a1dcd901f426078a05c1dc2d1f3cbac7f206234059122641
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 4640 bytes
SHA-256: eeb89192fb128b544e1479b6e906d8672547ce1d0f4602146d53cef8e1adbea6
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 11352 bytes
SHA-256: f06de002dbbb0e85a1464ec632ccdf590e53e92a69009226c11f7bd733c4fef9
font_03_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16292 bytes
SHA-256: e8d926c57c79177bcd998787b3bca8c4818e0368ae16873fad3ced2ace8c0a3e

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