Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea91dda94c4056d…

MALICIOUS

PDF

83.0 KB Created: 2021-04-24 09:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c73e399de42ac7001969e4510c194eaf SHA-1: 84bd4c3ffbb7c3d2fb653dc41210cdc885b072a9 SHA-256: 4ea91dda94c4056d3a8ee94741e27902d611af08e2060be0fc893a47bf97dd4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many hosted on dynamic DNS services or link shorteners, suggests a phishing or spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=ross+stores+opening+back+up+az
    • https://cdn.sqhk.co/ramidazumiko/lhhuD84/raxosimosujujitutekaw.pdf
    • http://organicnu.info/gun_mod_for_minecraft_pe_downloadad355.pdf
    • https://tomanudiz.weebly.com/uploads/1/3/1/6/131606325/wobagoji.pdf
    • https://cdn.sqhk.co/tibakekavero/legfxii/teromufo.pdf
    • http://phillipen.online/44174609879bsx57.pdf
    • https://zuretajobujab.weebly.com/uploads/1/3/1/4/131483148/wasirewole.pdf
    • https://cdn.sqhk.co/kurafuso/hg9ic0W/40518575560.pdf
    • https://cdn.sqhk.co/rovujesox/Fhiepgi/kugunanozuxa.pdf
    • http://rivepozepuxar.mywebcommunity.org/serum_albumin.pdf
    • http://cccckkkkkdd.space/80347871218jmdn7.pdf
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/541954e81975a.pdf
    • https://cdn.sqhk.co/mogowepuw/ejdihep/vuzewik.pdf
    • https://cdn.sqhk.co/madufuxenuw/chegcjd/tatud.pdf
    • http://aycotoro7.xyz/tipadigeniposxmdx2.pdf
    • http://fullstacket.online/black_cherry_ice_cream_recipe_cuisinartikkpn.pdf
    • https://cdn.sqhk.co/kinifukix/zjfhgGC/tony_and_pepper_iron_man_armored_adventures_fanfiction.pdf
    • http://it50disconto.pro/batman_the_long_halloween_movie_release_dateu6gav.pdf
    • https://cdn.sqhk.co/wavoperusina/5BhfheF/jumbling_reasoning_question.pdf
    • http://olymp-trade.top/hugo_weaving_movies_20200sdr4.pdf
    • http://shtancircul.site/section_62_of_the_law_of_property_act_1925_explained1xlo3.pdf
    • http://moymagazin.xyz/excel_weekly_employee_schedule_template_freem4ms2.pdf
    • https://cdn.sqhk.co/dowusutitozi/Mlibie2/plumber_24_hours_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://merovuditipin.onlinewebshop.net/gulumarivolumelitimowabaw.pdf
    • http://suxudogakol.myartsonline.com/wimarufumixiwox.pdf
    • http://jazopizebe.atwebpages.com/case_study_houses_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f990.bin
3fe85817b74a58e7a4a8ba3481d6bf5b468f811efffbf074496bc4ad3f075202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 5212 bytes
font_01_sfnt_off00010b66.bin
4f42be5d57522aa450671c39e5d9654ddcb5ef73a2723dc09da026b22b307268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 10688 bytes
font_02_sfnt_off00012ff8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 4324 bytes

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