Malicious PDF — malware analysis report

Static analysis result for SHA-256 b557992d24537cd3…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 02:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d43a55d2a30d5247230c606f88ad8a7e SHA-1: 9746d2700c831e7b95d69a87d4b96f7f48cf0cd6 SHA-256: b557992d24537cd3a2b351aab2040046392a68ea43425a029dc0b20cca2781b2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links to disposable domains, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence suggest the document is designed to redirect users to malicious content, likely a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=algebra+1+factoring+special+products+worksheet PDF link annotation
    • http://tovelksa.website/latavumenw0nq6.pdfIn PDF document text
    • http://welojesuvarari.iblogger.org/vilil.pdfIn PDF document text
    • https://joxinisedubetif.weebly.com/uploads/1/3/4/5/134594754/8a1836fc421.pdfIn PDF document text
    • http://qiwi-wallet.online/make_money_from_home_canada_legit9bgvs.pdfIn PDF document text
    • https://loxugajasogilo.weebly.com/uploads/1/3/4/4/134476701/badututeveba_tuvikugituna_sekazeweme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60018fe972b5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_60020c744db95.pdfIn PDF document text
    • http://skout.tech/394121590763n2dy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_60174914286e1.pdfIn PDF document text
    • http://blu-ital.space/29834550285zd1or.pdfIn PDF document text
    • http://demask.space/81550869063p4oil.pdfIn PDF document text
    • http://lesantyqas.online/ap_statistics_2015_frqwo5z9.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/gogozopeguxinomodos.pdfIn PDF document text
    • http://scoretdho.best/56628644409wwn7s.pdfIn PDF document text
    • http://gavefunene.22web.org/budizilanul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff634c04fd5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ea80801ca2234c8eb0915406df6ca266.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_d751eebcad084020822277f5ba5b5c4a.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_b6d2155bd5bb411f9743c7fdaabd96e9.pdf?index=trueIn PDF document text
    • http://bolilolu.epizy.com/utorrent_64_bit_free_softonic.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_79f596ae2c8b4874a2d10d017d365aaf.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5756 bytes
SHA-256: 0d23a6d3bd2f69cf5a335d21b7866e9a4cb8470e74d59cca8b1ca70bdf452cc1
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 11584 bytes
SHA-256: d7e858908cd919413fca46c85ebd3b8e1141c0ebfff1709c36038796e317746a