Malicious PDF — malware analysis report

Static analysis result for SHA-256 745f3a4dde95ed5b…

MALICIOUS

PDF

87.1 KB Created: 2021-03-24 08:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 752e18a905ea34d1b3f4a9ea742b22fe SHA-1: f16f19ecdbf684ba460a8c2b82c79ab07ccc0759 SHA-256: 745f3a4dde95ed5b0ca074b919370f3cf87719fa8372658d6ebfd0a964c95cf6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to host malicious content. One of the primary external links, https://jumiwimov.ru/award?keyword=all+i+want+for+christmas+is+you+chords+pdf, suggests a phishing or malicious content lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=all+i+want+for+christmas+is+you+chords+pdf
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6010a228b38f2.pdf
    • http://gugibugud.mygamesonline.org/64242297620.pdf
    • https://cdn-cms.f-static.net/uploads/4415077/normal_6035f7eda8dc4.pdf
    • http://fovikoxesaweziz.medianewsonline.com/asme_b36_10m_2020.pdf
    • http://senenetikoxikom.22web.org/wow_classic_balance_druid_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4500189/normal_60259d2c6e9ce.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_601d518e113c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sowewazulejewi/77493932270.pdf
    • https://s3.amazonaws.com/defujo/porugibinuragonutuzu.pdf
    • https://s3.amazonaws.com/paxivogedewilu/celtic_rangers_tv_guide.pdf
    • http://muwalolerede.epizy.com/choices_mod_apk_latest_version_free.pdf
    • https://s3.amazonaws.com/sabegokek/bordier_cie_annual_report_2017.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_87146ad7c68c4a8ab270f29515e5569a.pdf?index=true
    • https://s3.amazonaws.com/tesotiwapax/string_to_hex_java_android.pdf
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_72a16a91b998425c9abb3e6422ad403c.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_188cc101b48643238438b6f29d6b34e3.pdf?index=true
    • https://s3.amazonaws.com/sifawekujiki/fivb_scoresheet_2016.pdf
    • https://s3.amazonaws.com/fomudebipefasu/vevezuxuvaxijagulewo.pdf
    • http://xofemamerisip.epizy.com/how_much_is_a_real_christmas_tree_in_florida.pdf
    • https://s3.amazonaws.com/gudukupir/vipojupujukedowo.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_off000100c1.bin
b6905c1941ea1c62bcf1f001a7d14d7f7f00a8f47f45b0dcdcbc54a3cb5799bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 5580 bytes
font_01_sfnt_off000113ac.bin
5c14002df5708806e49de76deec1a67ed0cdd2f72a85ae7eb001bf12fe28b60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 10880 bytes
font_02_sfnt_off000138ab.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 16312 bytes

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