Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec971a7402f8636…

MALICIOUS

PDF

82.2 KB Created: 2021-05-22 10:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4c31fab6984a79618ad3a111f034ec0a SHA-1: 1b10c5739a6db6572799107b9b7228dba7dfb3d2 SHA-256: 9ec971a7402f86362aa85231c59d6e81c415d6f0d8ed6e16b7f0594917654311
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains text related to downloading music on Android, serving as a lure. The presence of a malicious redirector link and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://dafemum.ru/strik?utm_term=como+baixar+musica+no+android In PDF document text
    • https://volovumonanegom.weebly.com/uploads/1/3/5/9/135967081/vejuduxumalugu-rokanixapix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_6013ba8d554e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60693feab5ce9.pdfIn PDF document text
    • https://mejiwixibunoxu.weebly.com/uploads/1/3/4/4/134402053/jerojonemul.pdfIn PDF document text
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/1642619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5ff4deb921df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_6065af1f61e08.pdfIn PDF document text
    • https://gisafumeg.weebly.com/uploads/1/3/6/0/136098567/dufin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_606b53ff2ca7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_6025cb09c0fa0.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/8305307.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/75e493f76477.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/479894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fdb27a6979cf.pdfIn PDF document text
    • https://warazafipa.weebly.com/uploads/1/3/1/3/131381481/dibibomunerajenuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_603b19db59eb4.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/3587953.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/0ba882.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/mavumozeg-lilat.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/8d763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_60637b028a9db.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/xugigabitulu/red_and_blue_handwriting_lines_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/sugilupepo.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/target_operating_model_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/agri_application_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/java_ascii_table_formatter.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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 5164 bytes
SHA-256: b1da2b50924686ea50d65db70fcbf6fa479b7b549d9765d0f64b1f1310a06cd9
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 12792 bytes
SHA-256: 7194b8ed0aea9a6e41775b950c1759ea55cd7939e6c2c251210118e0643f827f
font_02_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 16140 bytes
SHA-256: 94f2905be1d36336c8d1d267a797c490b2dd80e9c3cb4275371b63323294700e

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