Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ded10f340a091b…

MALICIOUS

PDF

78.8 KB Created: 2020-12-15 05:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c8ebefebc9e59149b2d712498801ef2a SHA-1: bf7b6b821f73852fffae3329b04ad0571492086a SHA-256: 40ded10f340a091b01e272f44901c9408273bc323e1396f5e2fb3c833fcd2390
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://trafffe.ru/123?utm_term=lab+5+cellular+respiration+pre+lab+answers PDF link annotation
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/8807485.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/gegeniwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fcec226ddfa2.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/3497966.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/famedovos_jenezeditutu_fefopemuw_vopebezo.pdfIn PDF document text
    • https://bawimivumo.weebly.com/uploads/1/3/4/6/134609907/gebejomanujajolupi.pdfIn PDF document text
    • https://wuserugojikenek.weebly.com/uploads/1/3/4/5/134513610/96ae7f8.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/8332107.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/zirojopemup/sir_alan_gardiner_egyptian_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/fofetimilevukawegigeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf23c2b-18a8-4ec7-b262-f9a9b87a5683/33564213644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599c50f5-39b9-4119-a558-4e51bd834eb3/apk_do_desenvolvedor_clash_royale_2017_download.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_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 5224 bytes
SHA-256: 37d5e85656554432c517f6c8bf93661abe73ab84e36170ec2343ad4329c816b6
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 11232 bytes
SHA-256: 0a348f1a3a23cdccdfa2f903233334ec7008240f2f921ff22db50940ff292a92

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