Malicious PDF — malware analysis report

Static analysis result for SHA-256 48738a88d974981c…

MALICIOUS

PDF

83.0 KB Created: 2021-04-16 02:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5fa47559396fb1677e7f2b2c4a9725b9 SHA-1: b530a7bdff508c451992413ed1798e116a33de2c SHA-256: 48738a88d974981ca64d4ea8510848177987f2f0e105a3aaca720868b6fdf5df
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable hosting and employing UTM parameters, indicative of SEO spam or phishing lures. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+calculate+cube+strength+in+percentage PDF link annotation
    • http://vataponuxizeliz.mywebcommunity.org/antibioticos_betalactamicos_farmacologia.pdfIn PDF document text
    • http://reabook.online/jipodufetodatatobmkxba.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/novilipu.pdfIn PDF document text
    • http://futajef.medianewsonline.com/pdflatex_compile_bibtex.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/lozas.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/4066899.pdfIn PDF document text
    • http://rupiwot.getenjoyment.net/masifikikonixumu.pdfIn PDF document text
    • http://trastenmyqort.online/vokapifolawep3n8f3.pdfIn PDF document text
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/3842772.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://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_3b6ce95553904d638c7c96a0972897fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9820148-c077-4aba-bc6c-1fe12fcf2336/89848543502.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_ca9dd5fb07af4e67979c51ed5b172ac8.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_12a94903bb774e658bf29c923a63f4c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91b2ca0-4096-46f9-9ab7-d24adad9e2a7/41783316422.pdfIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_4cc9f0dd3b4b438ba77d6eed79827bd2.pdf?index=trueIn PDF document text
    • http://pedirite.onlinewebshop.net/jerodupapomoxuvuwojewa.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_770b422da0e244f6af1370a06ea4d79c.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_1487a9cd7014466d98d83452a6aebc64.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_c7c8a808880d452486994b481fc66cb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63137507-866d-49ef-b59c-c6f41371db8b/21248950907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776d9c8d-27a2-43e0-bf23-2e8c0ea60501/how_to_setup_arris_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01acbb7-a26a-4c47-9f99-7dd98871f8d2/28775709762.pdfIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_8ab9453594af400e8e4d3f072472eacf.pdf?index=trueIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_3ac77db41f514fe990e8708b2dd2d50e.pdf?index=trueIn 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_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 5268 bytes
SHA-256: e7c075892b29e990e23f86c46018004fdb87ff778d8bed789b5782b82275b71c
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 11060 bytes
SHA-256: f1d732404aa58a092595f6e92c5e901126a8b8417ca62891c734a3681e5d571c
font_02_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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