Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3cd68615440669…

MALICIOUS

PDF

68.5 KB Created: 2021-02-26 00:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ba067d9e87b58adff695bfb465b103c SHA-1: d79f49b0ad9225272eeadf046b6f6563ebe4d35f SHA-256: 1a3cd68615440669bcf6f271ab07569044d8c0c9c32cd0aa4911d3d49c200375
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 pointing to various domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or to manipulate search engine results.

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://maypoin.ru/wix?keyword=chapter+8+section+2+expanding+public+education+answer+key PDF link annotation
    • http://form-copyrightservices.com/tirukoteweka42x.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/2884192.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/xedagipexuvor-lajapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5ff8ea239fa0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_6015d39b994fc.pdfIn PDF document text
    • http://dakujuzoma.22web.org/craftsman_battery_charger.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/8bf4e31ec54.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/45615832627.pdfIn PDF document text
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/23b164a.pdfIn PDF document text
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/e31aaba250e8f.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/3449caf20.pdfIn PDF document text
    • http://nout-prokat.website/nier_automata_sealed_shrinesqq6p5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_601e01f631282.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/punejed.pdfIn PDF document text
    • http://4kuhd.me/nier_automata_short_storyw8e7s.pdfIn PDF document text
    • http://gevifavilovaz.22web.org/android_canvas_draw_image_from_file.pdfIn PDF document text
    • https://soxagunolipug.weebly.com/uploads/1/3/4/8/134887217/tekuti_minat_gotakozolukodas_romerap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxekijonudi.epizy.com/sulija.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/john_deere_71_planter_history.pdfIn PDF document text
    • http://nivedopiganezo.epizy.com/kaxakisebewasadoneji.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_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 6032 bytes
SHA-256: 245fd340cda61dcaf8e1e81d42fa8bfabe8f9f828cc03b083c6fd4d017608d3e
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 9956 bytes
SHA-256: 23f0bb9f3d20b824ae48329b21d5a2003c88caec8623bfa737779fc0cac4bcd7