Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0914db9d5fc7a2…

MALICIOUS

PDF

107.7 KB Created: 2021-04-26 05:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf10bb62580fdcaff17db7d69d98cf3 SHA-1: 76fbaf62587942b45aa589d066715a2549b1aca6 SHA-256: aa0914db9d5fc7a2153e3c2086df114d2f5f1a254c4a7d951e7460d30fd9a87f
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to domains such as jacksth.ru and reweder.site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+make+a+small+flying+drone
    • http://reweder.site/negulanegikobadaduseramar67ibk.pdf
    • https://cdn-cms.f-static.net/uploads/4379474/normal_601d59f2a526f.pdf
    • https://cdn.sqhk.co/nuxoporerom/Nhi0tgd/fumovalo.pdf
    • https://cdn.sqhk.co/suxepemup/DEYmigo/84129933831.pdf
    • https://cdn-cms.f-static.net/uploads/4366339/normal_605daa99043c5.pdf
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/kabirusa-zogiwidiko-tiset-kufim.pdf
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/8ccfcff3f16.pdf
    • http://remont-kvartir-otzyvy.moscow/ejemplo_de_historia_natural_dela_enfermedad_del_denguex34e2.pdf
    • https://cdn-cms.f-static.net/uploads/4482188/normal_5fd1e73897326.pdf
    • http://belldiscount.ru/vector_art_3d_models_free_downloadmwsla.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_2ee58ae4c47f47f48c2eb9a483b5a5f3.pdf?index=true
    • https://s3.amazonaws.com/sefipa/6695087968.pdf
    • https://s3.amazonaws.com/dozuga/business_appointment_letter_format_sample.pdf
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_d8efcd853ed14734afbc3f2909268dfb.pdf?index=true
    • https://s3.amazonaws.com/woberiz/aspiration_treatment_guidelines.pdf
    • https://s3.amazonaws.com/gezetega/28959017090.pdf
    • https://s3.amazonaws.com/bejeseja/canon_selphy_not_turning_on.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001675f.bin
d17df42f6b4ac4633000d48e802046d5657a928fd1b2555c4b13a4e599738e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1675F 5444 bytes
font_01_sfnt_off000179ea.bin
7abeb3586395e20365bcd9c71222ca012b81f022da87e5db55c6ad48fccb57ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179EA 11636 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.