Malicious PDF — malware analysis report

Static analysis result for SHA-256 be55532942713607…

MALICIOUS

PDF

75.8 KB Created: 2021-01-13 05:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f590008ef4c563fa132cb5e624f901b5 SHA-1: d070954c6973048d6f2a2563cf4bd8411f874780 SHA-256: be55532942713607775692327f4622931f2d5f39b9e74e8947b05aef2f77a81a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of links to external PDFs hosted on various disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The presence of a link to a known malicious redirector further supports malicious intent. The ML classifier and ClamAV detection strongly indicate this file is malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=dmt+in+every+living+thing In PDF document text
    • https://kigejowozunafuf.weebly.com/uploads/1/3/4/8/134883406/nagofigevej-viwegelem-fozodenalan.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/wuwugikepegalimolu.pdfIn PDF document text
    • https://xobisajak.weebly.com/uploads/1/3/4/2/134234638/kebuwev-fusixo.pdfIn PDF document text
    • https://site-1211253.mozfiles.com/files/1211253/birthday_cake_with_name_images_for_baby_boy.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/b14b3b6f41.pdfIn PDF document text
    • https://wufaxewixebel.weebly.com/uploads/1/3/5/3/135302410/4718469.pdfIn PDF document text
    • https://site-1179820.mozfiles.com/files/1179820/weathering_and_erosion_worksheets_grade_8.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/ruvaramefese.pdfIn PDF document text
    • https://site-1172119.mozfiles.com/files/1172119/97665861023.pdfIn PDF document text
    • https://site-1177773.mozfiles.com/files/1177773/12933131961.pdfIn PDF document text
    • https://mewotevavaxaviz.weebly.com/uploads/1/3/1/0/131070751/1605585.pdfIn PDF document text
    • https://site-1166752.mozfiles.com/files/1166752/python_3__7_2_online_compiler.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/zemojutowumonigal.pdfIn PDF document text
    • https://site-1177944.mozfiles.com/files/1177944/87615283253.pdfIn PDF document text
    • https://site-1180242.mozfiles.com/files/1180242/dragon_ball_legends_twitter_friendship.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 4872 bytes
SHA-256: a668d8c5d4fb7f7817db185612626d3509e317a5ab162ec2445420e68670a4b7
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 10088 bytes
SHA-256: 9c310d6d5155367df3d070286136a5727cdf0502be8948ecfb1c0ec09366e95d

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