Malicious PDF — malware analysis report

Static analysis result for SHA-256 b150244a105870e3…

MALICIOUS

PDF

80.2 KB Created: 2021-03-29 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: eadef80c59370796a8f2ceba53e1f9e4 SHA-1: bd20dcc8cd0b0121f24a4f95a0effad033da9f49 SHA-256: b150244a105870e3bfac32e4638ee1b808558cb5140e10829e23cc48b70afd12
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it may leverage PDF vulnerabilities or embedded JavaScript to redirect users to malicious sites.

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://bologen.ru/award?keyword=pdf+agama+hindu+kelas+11 PDF link annotation
    • http://hardcreditcheck.info/sniper_training_school_for_civiliansrehoy.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/cisco_catalyst_2960_x_datasheet.pdfIn PDF document text
    • http://sapazukuwujoji.22web.org/light_refraction_worksheet_answer_key.pdfIn PDF document text
    • http://myluckybet.xyz/prescription_safety_glasses_frames_onlygvjwg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5feff91168a49.pdfIn PDF document text
    • http://healsmall.space/najujoxaretbqtsl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_601a8241d17dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_6007d5e34e636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7dc3ed208f4e43549b4812d63bf56e0b.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_cdde0b0b77aa4a52a6c00bd0fbd0e7e3.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_d59fcbc56f72452aafb3985a3baba07f.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_f7c5139e03b24541a246d1a73914f147.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_d27010f68b1f471388be51bfa2f44e67.pdf?index=trueIn PDF document text
    • http://vapewokadovusa.myartsonline.com/carte_du_monde_vierge_avec_pays.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_bfa95ae8caf24adb8bf573f5d41a0117.pdf?index=trueIn PDF document text
    • http://rugadugekowe.epizy.com/52424972490.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_6530ac43b8eb4bad9b0a0991332909b9.pdf?index=trueIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_827b9a3300ab4aeb903c0e0dc755ab0f.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_c0667edc660b495f881fd5f8e88e1ada.pdf?index=trueIn PDF document text
    • http://rabuvof.rf.gd/likapabedege.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/joseph_prince_church_location_singapore.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 5344 bytes
SHA-256: d7612494fbbc8f43cd663ee42c5d0c89810cd47d4b69e36bafc4c744d1758e9f
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 10156 bytes
SHA-256: c57614c1aa8c28c540213584aa1b976d9368ad0449f2146b0390a8b313bbba06