Malicious PDF — malware analysis report

Static analysis result for SHA-256 febbe3cff6470fd3…

MALICIOUS

PDF

89.4 KB Created: 2021-03-09 03:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 59e51855cdeb9c1012bfc722dbb370a6 SHA-1: 418832bd92446c41ad2ba980d654518960a56965 SHA-256: febbe3cff6470fd3b19bedac912183fc2c575751f6a09220857f32416bad8a82
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=poliarteritis+nodosa+en+ni%25C3%25B1os+pdf PDF link annotation
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/3aa85f01ab93.pdfIn PDF document text
    • https://cdn.sqhk.co/dikarulik/gvhiCjc/tower_defense_simulator_cowboy_nerf.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/aiKeieR/rufebodepazabusukifokolop.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/gowetezexijo.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/2hggegi/fingerhut_mobile_site.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/voromoxet_sixetarukawi.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/iTJTjff/mtg_commander_rules_planeswalker.pdfIn PDF document text
    • http://ewop.space/42365682308hknbz.pdfIn PDF document text
    • http://hushseo.online/how_to_do_limits_in_calculusce88z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_6737f26b06224232aa5fda92c64b4f77.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_2edfa65a67634049aeaaa54adf8fdf76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/analogy_for_ssc_chsl.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_65f960fdea11493db72b4df7b61f5676.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/64875895589.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_274a296234c84924a27ded82431688fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/deteniwaxiwanadojozezu.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_e9bced0f7a1d4c5c89e33ddccd531a58.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_a16bc68e0a5045aa879b33e44ef67bf0.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_1557b010b74040ada36dd3c2428863b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/13105691913.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_0e4dcdf8672c4bb39151d347692bf8d9.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_88c47fb2408740389eceeed8ad2b9c1c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 5248 bytes
SHA-256: 2870adc545bc5589ef347ed97132492b1ab8320d235b5f4667aec7812e2323e8
font_01_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 11684 bytes
SHA-256: 16ffa16ee78398029cd8f9b662d7a75b1db149d26af404c0e5280d5c00c6166c