Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28a6bb6dfd4f948…

MALICIOUS

PDF

73.9 KB Created: 2021-03-05 16:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ff32d40615c336a36a5d2ae536a894b1 SHA-1: 1f2f02e75198524dd270ca7813e3f7baf5d30cf0 SHA-256: b28a6bb6dfd4f9482eee5f125d2859eb40595446f62742dee80f9ff78fd1a68c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to a search query about mental illness, likely to entice clicks on the embedded malicious URLs.

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://leonvi.ru/strik?utm_term=what+mental+illness+does+the+man+in+split+have PDF link annotation
    • http://wuvevaj.iblogger.org/bopugifusosiwejo.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/jabejerigibobidan.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/e8655.pdfIn PDF document text
    • http://kvyovk.xyz/nulokonuronijujosc4py.pdfIn PDF document text
    • http://uplrezina.site/722879249657713o.pdfIn PDF document text
    • https://jofexudu.weebly.com/uploads/1/3/5/2/135295173/junabigixarapagoliw.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/najovedikipijam-nekiru-nupomagamanepe-ziwiwoleza.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/defop.pdfIn PDF document text
    • https://netajeripen.weebly.com/uploads/1/3/6/0/136053717/ramigabekuwameniroz.pdfIn PDF document text
    • http://dashcamtopbest.com/mat-_checkbox_reactive_formbyn9w.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/vanajozati-kezedego-tunofotaz-wunese.pdfIn PDF document text
    • http://usesoda.pro/zabibusuxurasvj4.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/8185681.pdfIn PDF document text
    • http://basiditdcf.space/cars_colouring_pagesd359o.pdfIn PDF document text
    • http://ideal-it.fun/delobuwefagoliw4u0b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimitafukufes.rf.gd/kiviworuder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3323c1dd-80ca-43e1-90c3-80dd66f08a0e/12283886826.pdfIn PDF document text
    • http://lenegimuni.epizy.com/12168918035.pdfIn PDF document text
    • http://fewetero.epizy.com/poxuxofezuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670671e2-5a06-4fbc-8343-097be14d2500/what_is_security_engineering_principles.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/bala_bala_song_lyrics.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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 5176 bytes
SHA-256: e6907f2d5a21431f26dceeb5df04bea301864bc25090f7224fbf10c34cc92c93
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 9992 bytes
SHA-256: 026a6ec09c07d4526ba9b2f8027af291971af593290dd4a6205bc77e0c78c2d5

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