Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de9f730cdc8a7ab…

MALICIOUS

PDF

72.3 KB Created: 2021-02-20 19:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7be1caacc1cba2be5ab9d62d60304bc3 SHA-1: 229aebbde4230218becc9328bd21917c06bac1ac SHA-256: 8de9f730cdc8a7ab7e3b6dd1c6f2a26f911c0ae99a26093c690c1bb5408e11bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/123?utm_term=what%2527s+static+and+dynamic+characters PDF link annotation
    • http://dizaxabon.iblogger.org/zijakulapefamevizakelapi.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/hgjjCUm/koponed.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvezunotumu/ejjgOZQ/88114660578.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/BiWYijH/lototu.pdfIn PDF document text
    • http://salufogi.iblogger.org/12370133147.pdfIn PDF document text
    • http://difuraw.22web.org/android_retrofit_kotlin_callback.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/mgNkjhL/choppa_style_lyrics_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_60062d3140b4b.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/ific0gd/joe_rogan_talking_monkeys_in_space_full.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwumuni.epizy.com/false_ceiling_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/weekly_calendar_2020.pdfIn PDF document text
    • http://wosakev.epizy.com/semicolons_and_colons_worksheet.pdfIn PDF document text
    • http://lesexugisitu.rf.gd/sizuwekijawopun.pdfIn PDF document text
    • http://xeregolipota.epizy.com/2578536139.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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 5296 bytes
SHA-256: 519d32759d58942b93b23da7af098578f8f1db2c9d820be79ea3d69177058eae
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10468 bytes
SHA-256: b82e389eca4f9fb66dba1c1cacc46e1912ee75556e36a2fcd5c28ba216d6e6f3

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