Malicious PDF — malware analysis report

Static analysis result for SHA-256 9426501555bf599d…

MALICIOUS

PDF

77.4 KB Created: 2021-02-24 19:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: af7ee24d8e5245d7c68917f2a6de6875 SHA-1: d52ea09e3b01a617c94a5667748068ffaf442fef SHA-256: 9426501555bf599de7133da5696de912926843d69d56f4571e8ed5f2b3a53103
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, 'https://yafferge.ru/123?utm_term=why+won%2527t+my+dyson+vacuum+charge', is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=why+won%2527t+my+dyson+vacuum+charge In PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/8778908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6023fc0626a17.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/Uhhgdgc/fefedubidutetixup.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/bMhdSpd/zewapoforakupitirupirot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_602ac047ca04a.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/soccer_star_2018_mod_apk_android_19h05i.pdfIn PDF document text
    • http://otshelnik.net/9959456147033vz3.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/ijfih7w/kuboom_3d_fps_shooter_apkpure.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/8223597.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/7149335.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/tepedisijonixoxev.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/fhgfzoS/govofa.pdfIn PDF document text
    • http://idealica-official.website/assam_police_constable_admit_card_2018qvqsu.pdfIn PDF document text
    • https://sugevemaketajes.weebly.com/uploads/1/3/4/8/134873201/lixav_bipazu_sifiwagovake_birufevelaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_60011b09daa4e.pdfIn PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/pegodakorolokagobaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vebisop/convert_excel_spreadsheet_to_comma_delimited.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/55124610674.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/firojewodorad.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/hypertriglyceridemia_guidelines_endocrine_society.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/10785942444.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 5456 bytes
SHA-256: 314e173e27543af3ffe7d0a40aea77079e3cdf059e61b23007203e4e992bcc78
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10492 bytes
SHA-256: cd54d7b218694e83dbd34a7c7e737550fa6ec0a3985eec0348177110fcabf7b1
font_02_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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