Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ea6d63f5d879e9…

MALICIOUS

PDF

85.0 KB Created: 2021-04-08 06:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ab763c319ee81573ad40135bc2964be5 SHA-1: e8284d9b8764120405eb948fdd24d54544dab367 SHA-256: 22ea6d63f5d879e9125a41c8a5daf81b9e66c93f64413f16a92645f8ee19c587
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=irregular+verbs+past+participle+sentence PDF link annotation
    • http://medilawibume.scienceontheweb.net/vedurewamigojefewufafel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_603e0d6855fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_602f7bba7cb83.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/90761802784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_6008d4e136fd6.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/doxekukixumujesafebafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5ff4346abbb24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5fe6174c21eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409395/normal_5fe084da62f4f.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/wolopapanakuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_6046487d74b7a.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/5c2c99.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/599772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65bc29b448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_60288bfe159da.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/bertrand_russell_philosophy.pdfIn PDF document text
    • http://tesilav.sportsontheweb.net/73128674881.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/38203707206.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/zelosawalora.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/graco_magnum_x7_airless_paint_sprayer_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/57394421256.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/jenedimolopu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/calligraphy_printable_worksheets_free.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/fototugutewix.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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5236 bytes
SHA-256: 6952f744e12cbfbf0abd4ec71a03ac68cfd6975c1c50ae143bf38b0220a35719
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 11604 bytes
SHA-256: 4e05d18b21190da26e872a440838f2cd71e2162867fc24511615fd8c52205531
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501