Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da163154c924a23…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 13:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1551c3cb901170252520ee67d4d98179 SHA-1: 85094439ecd5ed2afcedef1de528cd76657bc0f7 SHA-256: 7da163154c924a2357d58cbd0ad682d4be39b68d17e528e2c5a25e99b1344523
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains and algorithmically generated filenames, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/61824800174.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb1bf49a---44720938427.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/88078555418.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/sobopapugogawewuboli.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/tojigitunewiseguvi.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910070529565242.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/fikebomom.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/dezowekutagijuj.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/83489873487.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/lebufamebosaka.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/73045532214.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/59832022909.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8fc871cf---xunotajawur.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/zobovagowutoj.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/zavepawebipozejopatadepev.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/74227066840.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gorulixizagar.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/juxabalovefizowubanu.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/42881258747.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/68959058518.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/29984621860.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/ladafujufulagovax.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/veliba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=firmware+for+android+tvPDF link annotation
    • 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://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_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 10428 bytes
SHA-256: f79fe1fc57ca9a764aecbb2c7c0c88148f1d3e57ed8d1f82e1703d4685a17184
font_01_sfnt_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17232 bytes
SHA-256: 6631ba32f9f9a2ac4bc56aa401cbe8287bc8ddec316a491738b789d7b60b5601