Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f858e762bc8331b…

MALICIOUS

PDF

61.1 KB Created: 2020-11-25 19:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6d899fbaac3ed82e7033aaa4c3972bd4 SHA-1: 16de263c407b4c6131915a6fc22d8c6b86eca779 SHA-256: 8f858e762bc8331b28b909fdad45158d0b904b5b9759720a697edfa34551f8b8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to a school, suggesting a targeted lure. No scripts were extracted, but the presence of a malicious URL and the ML classifier's high confidence indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://traffking.ru/strik?utm_term=american+heritage+charter+school+idaho+falls+id In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2fb65a-3fb1-435a-96f3-681dc52eb436/wenavojodaji.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/58070673671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fe8690-049f-4e85-959f-3b93f47d74d9/fagokubovusedumavesedamow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d700dd2-b5d4-46f3-bd7c-6210a196ec2d/masamune_kun_no_revenge_light_novel_baka_tsuki.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/xirepoletenerapizaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/calculus_by_larson_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6071fb3-4a8c-4423-9157-23d67fb994b7/why_are_ticketmaster_service_fees_so_high.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/69229139481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9d9e91-6ebd-4933-a969-30488d2ab0c3/coosaw_eye_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d04bef4-276a-4ce5-bbef-fb5763b395fb/wopogojizedukegawepeg.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/walmart_sheer_curtains_panels.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/15316766682.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/96360403004.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 5424 bytes
SHA-256: 2469792b06a6f18cbbc0d6dc55bd7598b1bcd23c5c5f36ba8f2e39ed838b4e3b
font_01_sfnt_off0000c1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E4 11064 bytes
SHA-256: 0a432364fcd11798ad94909725e8be522e508a50b99f76afb0deefb159204417

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