Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a0752dc9d4b393…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 00:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 49116869741b48982e37e83a585df021 SHA-1: 65b2a811660d4d6d4cb5ac6f9f4584bd2e1595a4 SHA-256: a9a0752dc9d4b3933f2a94313b3e7e45ab660fe19b345d01f50f950514bb6066
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=essential+elements+for+strings+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5fdb35b8d586b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6012312c5ece3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_601f840a25375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_6035c20dd526a.pdfIn PDF document text
    • http://vkysnaya-eda.site/cravings_chrissy_teigen_free1snp5.pdfIn PDF document text
    • http://misstourist.info/90329582644jnokd.pdfIn PDF document text
    • http://efarbok.xyz/tubakaxuwewadujifukosasurienm1.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/lisbon_subway_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_601c85947750f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61eeb8e05c.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/nightcore_switching_vocals_mashup50xcs.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/753d5c34-50ee-4e2f-a13d-44c4870a45ba/sv650_service_intervals.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_ae7cc3a5e51544aebc3c0ff99cafa06a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb23e868-868a-4315-8b3d-337463a1f8af/40904671072.pdfIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_aa089a84b95e4d0dbc990a9ffa7e2d68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d91cf65-e4f4-4650-a67c-bedb5101418f/nearby_search_google_maps_api_example_android.pdfIn PDF document text
    • http://xatidewivi.epizy.com/exercice_auxiliaire_etre_et_avoir.pdfIn PDF document text
    • http://zunijakokusageg.epizy.com/bokudulerajagaxetewo.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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 5316 bytes
SHA-256: efe461bb377605ea4d19d2e1f469b5d9a3c5e7497d31ae5aa8062fcbf95e9fda
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 11628 bytes
SHA-256: 790519f9bec8d2caab31e10917dc545c2b7d58fc9439a04b546893d523a698a2

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