Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18d399d37a8fc2e…

MALICIOUS

PDF

80.4 KB Created: 2021-03-12 00:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 58d75c93283feda6562dfcabd978085a SHA-1: 91e61f5fc4ac00fb4fe817f34a4bc55b8f283c89 SHA-256: f18d399d37a8fc2e426ee5cebec8dbf3c0f459dbb20ac090d570dfd342a62b29
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs pointing to potentially malicious or phishing sites, as evidenced by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=jstl+format+number+thousands+separator PDF link annotation
    • https://cdn.sqhk.co/lagitesavap/21wgdge/59838630737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6016f7a0a290e.pdfIn PDF document text
    • http://jopkapopka.online/439985749456l901.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/roteku.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/ihghjv7/word_collect_level_daily_challenge_answers.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/gifaxebopaxaxegiw.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/doganelima_dovawupedal_wesurewu_jolepezemun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453553/normal_5ffaf239cfafb.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/mabuzuxenuwidawiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fd31eb690594.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/labuw-pipow-gimezogapiwe-muzutasuzel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_604a97f046a1e.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/b76bf34.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/ChcrJ4Y/nosarolikumox.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/4941512.pdfIn PDF document text
    • http://blockingscenery.com/la_venganza_del_conde_de_montecristo_2002_pelicula_completai7dv7.pdfIn PDF document text
    • http://ita-bio.fun/26184153505hxpw.pdfIn PDF document text
    • http://dostafood.xyz/67215027755h8pj0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_ab0557172d074004bd58dea97ad8adb6.pdf?index=trueIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_6a61b4c65cc24dee8c2727903e8757ac.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_d995b9cc212c43929de9dda378a79c21.pdf?index=trueIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_b3e992b4bf9c452a9ee4ef21aed00142.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_5674e6290286400d9ed67bc082fefa93.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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 3548 bytes
SHA-256: 0f39b924d164b50b4a46f241ee119065a42ae602b424870a60b3fe8d646ecb54
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 5412 bytes
SHA-256: 67580d88f324a0c5fbeb517a6cfe13f288480b9f431442353e9446af655e015b
font_02_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 15332 bytes
SHA-256: 2f62531f1b0b05821c464bd39aa1cb843208ce1bad2a86c1a537b925b6a58c06