Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdef69edabb459f9…

MALICIOUS

PDF

81.1 KB Created: 2021-03-09 19:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e76a3ac29a33ae3bd69d8e00a802c2e SHA-1: b65034cc4960ad552dee55f0b27790e836becf2a SHA-256: cdef69edabb459f936a39b3c47edb5a6e7029c04f28daec8649662ad66a409bc
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of an SEO link farm and uses an image lure to redirect users to a malicious URL. The primary URL identified, 'https://midufefew.ru/award?keyword=cours+d+anglais+americain+pdf', is flagged as unknown reputation and is likely used to host a phishing or malware payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/award?keyword=cours+d+anglais+americain+pdf PDF link annotation
    • https://zotamitogimida.weebly.com/uploads/1/3/0/7/130775261/xovaramijeno.pdfIn PDF document text
    • http://itdiscount.info/30773503704krojy.pdfIn PDF document text
    • http://spain50off.info/calculus_textbook_8th_editionp1kxg.pdfIn PDF document text
    • http://mosdendy.store/wativ6ywct.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/sidilim-likarewu-ziloboxaze.pdfIn PDF document text
    • http://topcreditcheck.info/what_is_the_definition_of_external_structureewu6z.pdfIn PDF document text
    • http://verifedform.com/woguripirokovunajowilegy5ioj.pdfIn PDF document text
    • http://generalmassage.online/dragon_ball_z_shin_budokai_2_mod_pps7yv5e.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/5876827.pdfIn PDF document text
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/2b82e9851b01a.pdfIn PDF document text
    • http://haustova.com/171835228491lj7d.pdfIn PDF document text
    • http://oneshops.space/sport_vocabulary_exercisej849y.pdfIn PDF document text
    • https://xujajogasugoni.weebly.com/uploads/1/3/4/5/134514057/8501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kigavanus/browsing_history_view_tool.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_3c8a91986462445c906e226290e7c4c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/end_the_fed_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/71952708198.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/dogizivexoxom.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/dewapipubunugu.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_6053df401f924bbc8ce939d6b2b1cfa9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/why_is_the_half_life_of_iodine_131_important.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/fitters_diversified_berhad_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/59331568990.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_bb0e28761485486d8002c23f9ee293ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/android_review_notifications.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/33268564992.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_b0b41efb1421423fbecfb363cafd3733.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_59d75b077bd348ffa29e75de166b90f9.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 5380 bytes
SHA-256: 4e4f62bc6071d7f837bd0e72288ee5022f1d4dac08677630dc0f08aa6d53e975
font_01_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 12088 bytes
SHA-256: 29765c390f14adf573748aa7a3ec6ba0a6b91baf77cf58da583a389047f4b646

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