Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae905d863eadf53…

MALICIOUS

PDF

107.0 KB Created: 2021-03-30 10:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 15acb9982b4f20b5b44d3fea90e651d3 SHA-1: c60b1b73d58991ba11081a865ef711b3e2241c66 SHA-256: bae905d863eadf53fd49245ee23074e2cef62c0e557b2ca2dc7c941fcb6b29f1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a likely attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 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/wix?keyword=relational+algebra+queries+examples+with+solutions PDF link annotation
    • https://cdn.sqhk.co/wesuwajil/ab3mVNL/lab_escape_from_tarkov_map.pdfIn PDF document text
    • http://satomupudogoni.22web.org/52687856730.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/jjRMhcj/movie_maker_online_video_editor_mp3.pdfIn PDF document text
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/6229750.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/nulifuro-lenizuso-vomidotazif-kabiba.pdfIn PDF document text
    • https://baginemesurewis.weebly.com/uploads/1/3/1/3/131380932/zamolo-zojizufulifo-jurikoxop-sanubim.pdfIn PDF document text
    • https://cdn.sqhk.co/bedimiwojam/gXuZltw/zigezirumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6059c8c116391.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/ghggecf/69849354806.pdfIn PDF document text
    • https://bobifadilow.weebly.com/uploads/1/3/5/2/135295989/valeru_famuxupijor.pdfIn PDF document text
    • http://pekuxareja.22web.org/critical_thinking_exercises_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_6059904b820f0.pdfIn PDF document text
    • http://xonigej.mypressonline.com/zimekifa.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/statistical_tests.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fe055fe63ea6.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/heihjfg/53375753061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_604de8291eda0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvarijes.atwebpages.com/aashto_lrfd_5th_edition.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_6b0b47fc041349a58547f20557098e6a.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_c6f3c2103e20492498d3e8b11eed6d4c.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_2d7bee2d9b8f45cf902322a3ad301816.pdf?index=trueIn PDF document text
    • http://tijopuzotozume.rf.gd/lagu_ahmad_dhani_prabowo.pdfIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_885fc70f080d4684903d572e327151d2.pdf?index=trueIn PDF document text
    • http://bugenuvumap.atwebpages.com/4763364639.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001442a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 5668 bytes
SHA-256: 77b59c7d181fdea6cc864822a6da047cb720afec83191b07ec109aecb314d34f
font_01_sfnt_off0001576a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576A 14156 bytes
SHA-256: 397f07266414c46ff740c4a6e8561e3824e1309193fa627f41a98b903ede12f3
font_02_sfnt_off00018725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18725 16388 bytes
SHA-256: 193bec865e6613927aea38be4b8d7e7f7b38f8b779d6a7300331d285fbfdae9e