Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dbb71354feada2…

MALICIOUS

PDF

90.3 KB Created: 2020-12-17 04:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 91689ac3b97f0edc89203972b43e3832 SHA-1: 28be43b20b3111293cb76d554722212682b29aca SHA-256: f8dbb71354feada2ff3b58ed97bee5267c782e6ab61620e5cd96c256dac17d7d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a link to a known malicious redirector, which is designed to lead users to malicious content. The document body, though heavily obfuscated, appears to reference 'Craigslist raleigh nc cars for sale by owner', suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://gettraff.ru/strik?utm_term=craigslist+raleigh+nc+cars+for+sale+by+owner In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5f9fda7f15852.pdfIn 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/eac61fbd-1c5e-44d1-a4c4-4b6662707406/vudinafebepitevelameb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ad9588-09fe-42e5-a393-e9cdb21c3089/likabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f676ac59-9a40-4afb-bdb5-aa3b3791b093/27177234083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89846f13-d48c-4dd0-a70b-5016da2842a5/27590604225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73aabc04-9c1f-48c4-b66b-ac88b1b2501b/mejafawofogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cde764-f6e5-480d-897b-cc8fa94950f4/puvoreburitusomifoduwebez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67863696-1c7c-46f5-98a5-f15817e4dcbe/north_america_worksheet_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23eb1d0-e430-4bfb-be27-3167243e1580/dispositivos_electronicos_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/les_miserables_10th_anniversary_soundtrack_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6d569d-2016-4b7c-b4ff-c6343d3ffe67/4th_grade_fsa_writing_rubric_2019.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_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 27252 bytes
SHA-256: 71125d0b514abba3c872c50adf599872839d07f82c4e22739dffb88a6086a4b4
font_01_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 5384 bytes
SHA-256: 491bc90f17b709deb58cc8bd99010eb9b9d6ff9729d41505956e6fd4420f493f
font_02_sfnt_off0001359c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359C 11292 bytes
SHA-256: 5df1d582d050c97ecb612a13c95c8c0d055326af1cd4f4bcdcdb94bf5394cf55

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