Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37257cb4749d3ce…

MALICIOUS

PDF

75.5 KB Created: 2021-02-07 08:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ef8730fe1ea8bd1fd32241f575eafbb1 SHA-1: 0b3ad499cb40918ab17538f54606234118aed751 SHA-256: f37257cb4749d3ce45b8e27c68aa3546d4f177d66aac89e4bc29b343ac7710d7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm further supports this, as the document likely serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/aws?utm_term=incident+report+email+sample PDF link annotation
    • http://getveran.site/cessna_150_flight_manualk0pak.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/gdjfwUH/go_sms_keyboard_free_download.pdfIn PDF document text
    • http://callup.today/correct_form_of_verb_worksheets_with_answersucd1n.pdfIn PDF document text
    • http://italywow.space/33844222144l5uv2.pdfIn PDF document text
    • http://toppiksnack.xyz/mebawarelpbnw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5fceaa67cf1c6.pdfIn PDF document text
    • http://xowivek.iblogger.org/arkham_asylum_riddler_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/iijigiK/shooting_balls_3d_mod.pdfIn PDF document text
    • http://zoneeuro.pro/52618865304gqv1r.pdfIn PDF document text
    • http://inostrana.com/70271528743iicj2.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/sesafefanulokam/chat_secure_apk.pdfIn PDF document text
    • http://solujenujaki.epizy.com/ca_disability_form_2500a.pdfIn PDF document text
    • http://medomapex.epizy.com/gadoret.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/boutique_vector_free.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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 5156 bytes
SHA-256: 6124f735fd15d15927330cd88b86b1b5d84d34ff99fb624e7a35b7ef29cf86f1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10220 bytes
SHA-256: 9a526a36b14c1fdbbb82bad3dc22ecc4020f7242f9f5ce2c5cfc8f084918f001

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