Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b1ec5ba8781119…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 05:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d20e7c933ee6762a754a3c3d8fe944 SHA-1: 958f02390c3da6f935f95e6f55d06758d2d2bda6 SHA-256: 39b1ec5ba8781119ce8ae47fe8432b248a853b9f300a81fb18eb66ffa4be2142
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest this is a malicious document. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://nipisod.ru/wix?keyword=muscular+system+tour+worksheet+answer+key
    • http://laulu-go.ru/fonofuvi3vbzn.pdf
    • https://cdn.sqhk.co/seseniluvus/i1QijYf/jam_looper_android.pdf
    • https://cdn.sqhk.co/mofijovelu/hcFhfja/scor_pal_mini.pdf
    • https://cdn.sqhk.co/zowonefaso/pgfduhe/74455773467.pdf
    • https://cdn.sqhk.co/neratimo/CjfIdDi/53376315444.pdf
    • https://cdn.sqhk.co/wopiwozaso/jijajji/62713300767.pdf
    • https://cdn.sqhk.co/jufebarur/jjfghRX/wejedobore.pdf
    • https://cdn.sqhk.co/seranowe/eieKRAH/miburedado.pdf
    • https://cdn.sqhk.co/guvelebul/niathhE/13132750543.pdf
    • http://urott-hu.com/jumia_online_shopping_uganda_apk_downloadmbfec.pdf
    • https://cdn.sqhk.co/nulusezitelo/lCgcQja/kixabubefejevevakig.pdf
    • https://cdn.sqhk.co/tivinarafuvu/cyiY7oc/zaxoke.pdf
    • https://cdn.sqhk.co/wuzufoxo/hjgeI8L/jspdf_autotable_cdn_link.pdf
    • https://cdn.sqhk.co/kefofepobam/IgcjbJb/mukef.pdf
    • https://cdn.sqhk.co/lexelinowe/gdruifU/griselda_blanco_narcos_netflix.pdf
    • http://neo-tp.ru/kejebinubasedodi9airj.pdf
    • https://cdn.sqhk.co/temududote/eojfijL/26766376780.pdf
    • http://sushibara.net/mepanisimagoca73n.pdf
    • http://fitnesspack.net/bajudo4tm9.pdf
    • https://cdn.sqhk.co/sukonazukuv/8QghJAR/78747046199.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_f6ae04d700d54f49b6bb1e86cba0b23c.pdf?index=true
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_f1071563d03043d8b24bff5ebe06fe23.pdf?index=true
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_be6e93ae167a41f2b28cfca32be91adb.pdf?index=true
    • 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_off0000f5d0.bin
3cb687db0c520b9689ea453df4c282324a5a98ed3283c47acbefb8be1dd5fac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5304 bytes
font_01_sfnt_off000107d0.bin
eaf5757b267d2a086ab974766c38d51c018ce5f72c6292fbbed5e953c2b570ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 11036 bytes
font_02_sfnt_off00012dd2.bin
2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 16140 bytes

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