Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfde9347cda9b15…

MALICIOUS

PDF

81.6 KB Created: 2021-02-16 11:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c398c168b09d3f902bf40324d2e45377 SHA-1: 4e7155902a071097f64de0539847b5bd15afef28 SHA-256: bbfde9347cda9b15f6cd2aad572c5443c4d2ad0311e7d8aac3bc326823bf9501
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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
  • 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://jottigo.ru/strik?utm_term=what+is+the+gas+constant+r+for+air PDF link annotation
    • http://serdyukov.pro/keystone_credit_recovery_answer_key_biologyk35yo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ff9436847159.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/barimutudaruw.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/teboniduw.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/48c73a14d25026f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_6016b6a611041.pdfIn PDF document text
    • https://fufilotaniwa.weebly.com/uploads/1/3/5/3/135321354/laxoti-vijat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_5fd7d62906628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_60264c07b08d6.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/dcdc852200.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/8379496.pdfIn PDF document text
    • http://ridunculus.com/sora_yori_mo_tooi_basho_ostchx6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367305/normal_6009ac12af552.pdfIn PDF document text
    • http://bloodcraft.online/mcgraw_hill_texas_algebra_1_answersuqijw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_60253ab5937e1.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/dowesitobuga/bsc_math_books.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/upgrade_windows_10_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/addition_math_worksheets_4th_grade.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5124 bytes
SHA-256: 61fd00d8861e4d3829cc0459d8417018aee55717aea8d7cc2844f4cd75697868
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 11552 bytes
SHA-256: 290d9502b07b9ac9f7bf6b6441157448d1a796c0f6db094ee90cc4c8906b8853
font_02_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 16140 bytes
SHA-256: 9016b0efb5bc78e48799144d14d4e90692479dfd095c62393fb299dccf938700

Open this report in the interactive analyzer, or submit your own file for analysis.