Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab48ffebef64be3c…

MALICIOUS

PDF

106.4 KB Created: 2021-05-30 12:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 246da134e43f99d204d4a2e9f5a3a0b6 SHA-1: 2338b0deeb9abffa42960d7134ef0062cbd2b879 SHA-256: ab48ffebef64be3cd4999da78326c3e6aa98da052b316b9bec3fd644bc790720
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The embedded URLs and the heuristic findings of a link farm point towards an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://mezovuduw.ru/strik?utm_term=how+many+magic+tree+house+books+are+there+in+the+series PDF link annotation
    • https://mexavabawidusa.weebly.com/uploads/1/3/4/3/134375000/1bfcb5b2fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60229f864431b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478134/normal_60b1c49a16791.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/4882247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5fd1c76454b88.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/6452001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_5fd82caa8bd18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_60375c9ae784e.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/futosogiferopafixol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5fe30a885dda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_600bab46d1850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_6066af48d73b4.pdfIn PDF document text
    • https://didogetikazem.weebly.com/uploads/1/3/0/7/130776535/2819915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474470/normal_5fef8b3629e7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_6066503c92abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_603f71925f7b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fc5f9c544e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_606c17151252d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_60270ce5c7eb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_600249140d3f2.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/bijaso-nikobexi-dewusuzagi.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/wodif.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/legidepatarowifor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5fed19669e795.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/572df71.pdfIn PDF document text
    • https://tisudarolajese.weebly.com/uploads/1/3/0/8/130813738/379235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_6004eec64299b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 5192 bytes
SHA-256: d32c0f8165a25c93bf9ed38902807a82a8819d9f453940325328016a94dae6d4
font_01_sfnt_off000161aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AA 5540 bytes
SHA-256: af1aa02f6c81f013980856cbd23f8ea54ff1e2e30e8194dd9432d5f13dd37f14
font_02_sfnt_off00017471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17471 11420 bytes
SHA-256: e0a19e97bf251561355129e67972aa099b5675f94817a6dd1fac584753c2d5bc

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