Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f9c948df0ac9e5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 22:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d4c043bb84dc19b07b8d18e259748c2 SHA-1: e89d3477645381408f25d1103b07302591156c50 SHA-256: 23f9c948df0ac9e55ea2b35e9baa6aa158270fe397e0cb3768444be7a6489984
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=coordinate+plane+word+problems+worksheets PDF link annotation
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/gakeb_xobukabebif_bimuzotusupobes.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/1292096.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/viwuwo_linuvafom_kusotu_vepuwikox.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/rivibob.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/9251991.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/507b2c31293db.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/54b5a.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/e69da50be85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_9495a688152e41599e40b46bfde28769.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/945927b1-111a-463c-8335-b914530dbe4a/blackjack_chart_stand_17.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_588708f82d364a91a8c55cf998843260.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5280da50-fd66-461c-b4a4-170c5700d178/yamaha_p255_second_hand.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_e48416f7d7e140ccb93de91426aad21c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c246a7f9-0739-437f-ab46-c48937d35627/xunudenelaguvojujidipinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4befabcc-431a-4b71-b6f4-0252dc13c83f/55312145350.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_28a5ce26896541e6aff3691e77604758.pdf?index=trueIn PDF document text
    • https://7162416e-a815-4e2e-b4b4-2f1b6d3d7a1b.filesusr.com/ugd/0723a7_52e0c2191a53411098b6c6f31057f236.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b47c2e-6e85-4ca5-9260-16ef1bbc9e80/mawezorixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0839e9e4-8f08-4f1e-8abb-46678f4402de/where_im_from_poem_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf70106-8321-4f2c-93f3-e29e5f76724a/litonuw.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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 5400 bytes
SHA-256: 0559adfa2485833c3952259a8555672fb68e17b718bf40387bc0d4fe0cb93402
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 11224 bytes
SHA-256: 05836b8eada6839d3bb85ccddbf20f06a378f029b573fc7b2797e0569582509d