Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d051053999f2c17…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 14:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095a9e8e7cca483785120507f6bb1561 SHA-1: 22959db3e46c069094a3c98ddc7927995452661a SHA-256: 7d051053999f2c170e5cf905a9f653b982aed41b41defa9948a3c4b4ce79d210
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL points to a keyword-related page on 'soxebez.ru', and another link leads to a PDF on 'sportsontheweb.net', suggesting a tactic to manipulate search engine results or distribute further malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=pythagorean+spiral+in+nature
    • http://xomunuxeju.sportsontheweb.net/89863310559.pdf
    • https://cdn-cms.f-static.net/uploads/4464315/normal_605273373dfa8.pdf
    • http://fruittea.space/cost_accounting_cheat_sheetfzz5x.pdf
    • https://cdn-cms.f-static.net/uploads/4505326/normal_600c10a7aedc3.pdf
    • http://my-credit.info/mipavosevodalor75952.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/7245a04c4.pdf
    • http://kosonetibekub.medianewsonline.com/digi_002_rack_firewire.pdf
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/549273.pdf
    • https://nofojivebot.weebly.com/uploads/1/3/2/7/132740499/jivapami-pifejaxatexur-lurote.pdf
    • http://xewodatesuporob.mypressonline.com/strategic_advertising_management_5th_edition.pdf
    • http://trenketo.buzz/can_you_take_the_notary_test_online1emb5.pdf
    • https://cdn-cms.f-static.net/uploads/4452148/normal_601287e9b783d.pdf
    • http://bamefidev.mygamesonline.org/naduj.pdf
    • https://cdn-cms.f-static.net/uploads/4445733/normal_603dc3e3576ad.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6018e877a69db.pdf
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5fea2260525e2.pdf
    • http://nuxipawuxodiwa.getenjoyment.net/simple_past_tense_list.pdf
    • http://takipibimaxubov.sportsontheweb.net/where_is_the_fan_limit_switch_on_my_furnace.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_6011dc0c41155.pdf
    • https://cdn-cms.f-static.net/uploads/4393790/normal_60121ac814006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sawesupunozigiv.atwebpages.com/amar_ujala_uttarakhand_today_download.pdf
    • http://xakagigoneliv.myartsonline.com/limawabazuxudorugafabevel.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_off0000d45f.bin
a1ef61dcda8fb83a821ea335c7b7bd7797532093910ec92832782c47ff5757b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 5184 bytes
font_01_sfnt_off0000e60e.bin
416a921a2df98af8c72544091c34fe14d646e0d68db945011ad630276bbb3ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 11556 bytes
font_02_sfnt_off00010e11.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 16036 bytes

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