Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb355a330e03dda…

MALICIOUS

PDF

70.1 KB Created: 2021-04-02 01:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 44dd481826a881695e7a14d9d875f6fa SHA-1: 4dd2248560265c5751f518b165be006ff7fe9c88 SHA-256: ecb355a330e03ddae138af07c7000cacac352904ae60be142b032a85c04800fb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://mezovuduw.ru/wix?keyword=husky+utility+knife+blade+change', is presented as a search result, likely a lure to a phishing or malware distribution site. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=husky+utility+knife+blade+change PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454054/normal_5fcf07643d3e5.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/cold_war_timeline.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/93135781371.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/357462874626unba.pdfIn PDF document text
    • http://5dradio.ru/jerozuwunurejelevumudeju3sl34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_6059b9a48d603.pdfIn PDF document text
    • http://tvoy-ogorod.online/what_are_the_seven_pieces_of_the_armor_of_goddgbum.pdfIn PDF document text
    • http://creamwalls.space/50000943776nyqay.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://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_b55a2267a0c4492f91d8314ffc09b59d.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_115da368f207447c85bd96963d51f02f.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_4f659d7d2bc94f96b3ac554618e4d146.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_5059863dd9d448f6980b7cc160a8508d.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_9b57fbc143354ff6a8d8c117eae37b94.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_346211d6b6b04b4eb3ff77fce53379a5.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_9d9f617116a74bda88b30591ef9e8352.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_b15993613d2049e29687760807e4c012.pdf?index=trueIn PDF document text
    • http://vorisenunajix.myartsonline.com/mamalapaxoxigeven.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_0880f96cf17a4fb788a1b7c8271246e9.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_b11fc409a3204bf7a15fc9706d6edf68.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_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 5224 bytes
SHA-256: c932de08c7b292c995ba63a4c10ba1f72f804c5e7f34f7adeaa004ae2cc59e41
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10236 bytes
SHA-256: 9453e6ae5210569d9418ea8184521d601c8b67de14af585bda985621eeb21368
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3